Arowana Care Guide (2026 Ultimate Edition)
The complete, authoritative guide to Arowana tank setup, feeding, water parameters, cycling, acclimation, jumping behavior, tank mates, growth rate, and long-term care.
Table of Contents
- Introduction
- 1. Arowana Overview
- 2. Tank Size Requirements
- 3. Essential Tank Setup & Equipment
- 4. Cycling the Tank
- 5. Water Parameters & Maintenance
- 6. Feeding Guide
- 7. Why Arowanas Jump
- 8. Acclimating an Arowana
- 9. Tank Mates
- 10. Growth Rate
- 11. Common Diseases
- 12. FAQs
- 13. Final Tips
Introduction
Arowanas are among the most iconic freshwater fish in the world—majestic, powerful, and deeply respected in the aquarium community. Known for their long, sleek bodies, graceful swimming style, and surface-predatory nature, these ancient fish have existed for more than 100 million years. Keeping an Arowana is not hard, but it requires proper planning, stable water conditions, and a long-term mindset.
This guide is a full 2026 update, merging all critical Arowana topics—including tank size, feeding, jumping behavior, acclimation, and cycling—into one cohesive care manual. It is rewritten from scratch using expert-level standards while remaining beginner-friendly.
If you are preparing to keep an Arowana or upgrading your current setup, you can browse high-quality equipment in our curated sections:
1. Arowana Overview
Arowanas belong to the family Osteoglossidae and include several well-known species such as the Asian Arowana (Scleropages formosus), Silver Arowana (Osteoglossum bicirrhosum), Jardini Arowana, and Black Arowana. They are surface predators in the wild and are known for their ability to leap out of rivers to catch insects, birds, and other prey. (Source: Wikipedia)
Key Characteristics
- Long, sleek bodies with metallic scaling
- Large, upward-facing mouth adapted for surface feeding
- Extremely fast growth rate during the first year
- Powerful jumpers capable of clearing 3–6 feet
- Highly territorial as adults
Common Species in the Hobby
| Species | Adult Size | Care Level |
|---|---|---|
| Silver Arowana | 36–40 inches | Intermediate |
| Asian Arowana | 24–32 inches | Advanced |
| Jardini Arowana | 24–30 inches | Advanced / Aggressive |
| Black Arowana | 28–30 inches | Intermediate |
If you want to explore available species, see: Buy Arowana Fish.
2. Tank Size Requirements
Tank size is one of the most critical factors in long-term Arowana health. These fish are powerful, fast-growing swimmers that require horizontal space—not depth—to move comfortably. Arowanas grow extremely rapidly during their first year, often reaching over 18 inches in less than 12 months when kept in optimal conditions.
A mistake many new keepers make is starting with a small tank and “upgrading later.” While this may work for a few months, Arowanas quickly outgrow anything under 250 gallons. Their natural behavior includes fast dashes, sharp turns, and sudden surface lunges; insufficient space can cause spinal deformities, gill curl, stress, and jump attempts.
Recommended Minimum Tank Sizes
| Age / Size | Minimum Tank Size | Notes |
|---|---|---|
| Baby (4–8 inches) | 75–125 gallons | Only suitable for the first 2–3 months |
| Juvenile (8–16 inches) | 180–220 gallons | Needs strong filtration and open swimming space |
| Sub-Adult (16–22 inches) | 250–300 gallons | Minimum size for long-term development |
| Adult (22–30+ inches) | 300–375+ gallons | Larger footprint = reduced stress and less jumping |
If you are still planning your setup, explore high-capacity tanks here: Large Aquariums for Sale.
Tank Dimensions Matter More Than Gallons
Arowanas need length and width above all else. A tank may hold 300 gallons but remain too narrow for turning. The ideal dimensions for an adult are:
- Length: 6–8 feet (minimum)
- Width: 30–48 inches
- Height: 24–30 inches
A wider tank reduces skittish behavior and allows natural turning without rubbing their barbels or snout on the glass.
Common Tank Size Mistakes
- Choosing a tall tank instead of a long one
- Underestimating juvenile growth speed
- Using lids that are too light (Arowanas can punch through them)
- Keping them in community tanks that are too small to escape aggression
If you are unsure which tank size is best for your Arowana species, you can browse species-specific descriptions here: Arowana Fish Category.
3. Essential Tank Setup & Equipment
Setting up the right equipment is essential for keeping Arowanas healthy. These fish produce a significant bioload, require stable parameters, and can injure themselves if the environment is not properly designed. A professional-grade setup ensures long-term health and reduces the risk of jumping, stress, or disease.
Filtration System
Arowanas require oversized filtration due to their heavy waste output. You should aim for a total turnover rate of 6–10x per hour. Three filtration options dominate Arowana keeping:
| Filter Type | Pros | Cons |
|---|---|---|
| Sump Filter | Best oxygenation, customizable, massive bio-media capacity | Requires plumbing, higher initial cost |
| Canister Filter | Quiet, powerful, space-efficient | Must be cleaned regularly, less surface agitation |
| Fluidized/Moving Bed Filter | Exceptional bio-filtration, very stable | Must be combined with mechanical filtration |
If you need filtration equipment, browse: Aquarium Equipment.
Powerheads & Surface Movement
Arowanas thrive in oxygen-rich water. A gentle directional current:
- prevents dead zones
- reduces waste accumulation
- increases oxygen exchange
- helps mimic natural river conditions
Lighting Requirements
Arowanas do not need intense lighting. In fact, overly bright lights can cause:
- stress
- skittish swimming
- sudden jump reactions
Use soft LED lighting with a daytime cycle of 8–10 hours.
Heaters & Temperature Control
Arowanas come from tropical regions and require stable warmth. A temperature controller is highly recommended to prevent heater malfunctions.
Tank Cover & Safety Lid
Because Arowanas are strong jumpers, a secure, weighted lid is mandatory. Acrylic lids, metal weights, or sliding glass tops with clips are preferred. Gaps larger than a coin can result in escapes.
4. Cycling the Tank
Cycling your Arowana tank is one of the most important steps in establishing a healthy environment. Arowanas are extremely sensitive to ammonia and nitrite, and introducing them into an uncycled tank is one of the most common causes of early death. The nitrogen cycle builds colonies of beneficial bacteria that convert toxic waste into less harmful compounds.
A properly cycled tank stabilizes your biological filtration, prevents ammonia spikes, eliminates foul odors, and reduces stress on your Arowana. Whether you are using a sump, canister, or a hybrid system, the cycling process must be completed before adding the fish.
Understanding the Nitrogen Cycle
| Stage | Process | Result |
|---|---|---|
| Stage 1: Ammonia | Fish waste & uneaten food release ammonia (NH3) | Highly toxic — must reach 0 ppm |
| Stage 2: Nitrite | Bacteria convert ammonia into nitrite (NO2) | Also toxic — must reach 0 ppm |
| Stage 3: Nitrate | Second bacteria colony converts nitrite into nitrate (NO3) | Safe below 20–40 ppm |
How to Cycle the Tank (Step-by-Step)
- Set up your full filtration system. Make sure your sump or canister is running with bio-media.
- Add an ammonia source. Fish food, bottled ammonia, or bacterial starter works well.
- Test water daily or every 2–3 days. Track ammonia, nitrite, and nitrate.
- Wait for ammonia to drop to 0. This signals the first bacteria colony is established.
- Wait for nitrite to drop to 0. This signals the second colony is active.
- Confirm stable nitrate levels (20–40 ppm). Perform a partial water change if needed.
Most cycles take 2–6 weeks depending on the temperature, bio-media volume, and bacterial accelerators.
If you need cycling essentials (filters, conditioners, media), browse: Aquarium Equipment.
Signs Your Tank Is NOT Fully Cycled
- Ammonia above 0.1 ppm
- Nitrite above 0 ppm
- Cloudy white water (bacterial bloom)
- Strong rotten smell from the water
Never add an Arowana until your tests confirm ammonia and nitrite are both zero.
5. Water Parameters & Maintenance
Arowanas originate from slow-moving, warm, slightly acidic waters. They are hardy once established, but unstable water chemistry quickly causes stress, color loss, fin damage, and jumping behavior. Maintaining proper water parameters is essential for long-term health.
Ideal Water Parameters for All Arowana Species
| Parameter | Ideal Range | Notes |
|---|---|---|
| Temperature | 75–82°F (24–28°C) | Stable temps prevent stress & parasitic outbreaks |
| pH Level | 6.5–7.2 | Avoid sudden pH swings |
| Ammonia | 0 ppm | Even 0.25 ppm is dangerous |
| Nitrite | 0 ppm | Always toxic |
| Nitrate | < 20–40 ppm | High nitrates lead to head deformities |
| GH / KH | Moderate | Soft to semi-hard water preferred |
Weekly Water Maintenance Schedule
- 20–30% water change
- Vacuum the substrate or bare bottom to remove waste
- Rinse pre-filter sponges (tank water only)
- Test ammonia, nitrite, nitrate regularly
Monthly Maintenance
- Deep-clean canister (only 1/3 of media at a time)
- Inspect sump or mechanical trays
- Check heater calibration
- Replace carbon or chemical media if used
Water Change Tips
- Match new water temperature within 2°F
- Use conditioners to remove chlorine/chloramine
- Avoid stirring too much debris at once
- Refill slowly to avoid startling the fish
If you need water conditioners or testing kits: Shop Aquarium Equipment.
Why Arowana Are Sensitive to Water Changes
Arowanas have a large gill surface area and absorb toxins quickly. Any sudden change in pH, temperature, or hardness can trigger:
- jumping attempts
- rapid breathing
- loss of appetite
- fin clamping
Slow, stable maintenance is better than aggressive water changes.
6. Arowana Feeding Guide
Arowanas are carnivorous surface predators with fast metabolisms, especially during their juvenile stages. A proper feeding routine supports growth, coloration, digestion, and immune health. Improper feeding can lead to stunting, gut impaction, aggression, and nutrient deficiencies.
Because Arowanas are top-level predators, their diet must be varied, protein-rich, and safe. Live feeders should be used sparingly due to disease risk, while pellet training provides long-term stability and nutrition. Below is a complete breakdown of ideal feeding habits based on growth stage.
How Often to Feed (By Age)
| Arowana Age / Size | Feeding Frequency | Notes |
|---|---|---|
| Baby (4–8 inches) | 2–3 times daily | High metabolism; small, frequent meals |
| Juvenile (8–16 inches) | 2 times daily | Protein-heavy diet required for proper growth |
| Sub-adult (16–22 inches) | 1–2 times daily | Begin introducing pellets and shrimp |
| Adult (22–30+ inches) | 1 time daily or every other day | Overfeeding leads to fatty liver and laziness |
Recommended Foods for Arowana
- High-quality floating pellets (ideal staple)
- Fresh shrimp
- Crickets
- Mealworms (gut-loaded)
- Silkworm pupae
- Frozen fish
- Occasional live fish (only if quarantined first)
We strongly encourage pellet training because it reduces aggression, boosts color, and ensures consistent nutrition. For equipment or feeders, visit: Aquarium Equipment.
Foods to Avoid
- Goldfish (cause fatty liver disease)
- Wild insects (pesticides)
- Beef heart (too fatty)
- Chicken (poor digestibility)
- Inconsistent live feeders
Feeding Tips to Improve Growth & Color
- Rotate proteins weekly
- Soak pellets in vitamins once per week
- Never overfeed soft foods like shrimp
- Use floating foods to mimic natural hunting
- Avoid feeding right after water changes
If you plan to raise multiple species (like Arowana + Stingrays), explore compatible options here: Freshwater Stingrays.
7. Why Arowanas Jump (& How to Prevent It)
Arowanas are notorious jumpers. Their anatomy is built for explosive vertical leaps, allowing them to catch insects, birds, and small prey at the water’s surface in the wild. In captivity, these instincts remain strong—and without proper preparation, many Arowanas injure themselves or escape tanks entirely.
Most jumping incidents are preventable. They typically occur due to environmental stress, poor tank setup, sudden movement, or water instability. Understanding the triggers allows you to eliminate 90% of jump risks.
Main Reasons Arowanas Jump
| Cause | Explanation | Impact |
|---|---|---|
| Poor Water Quality | Ammonia or pH swings trigger panic swimming | Most common cause |
| Sudden Lights or Vibrations | Startle response causes surface lunges | Often at night |
| Tank Too Small | Restricted space increases anxiety | Frequent glass banging |
| Hunger | “Surface attacks” become more aggressive | Snout injuries, barbel loss |
| Reflections / Glass Glare | Arowana mistakes reflection for another fish | Triggers fight-or-flight |
How to Prevent Jumping
- Use a weighted, secure tank lid (mandatory)
- Install soft LED lighting with smooth ramping
- Maintain water parameters within ideal range
- Provide a tank with proper length & width
- Reduce reflections with black background film
- Avoid sudden movements near the tank
If your current setup needs upgrading, explore: Aquarium Equipment.
Common Jump-Related Injuries
- Barbel bending or loss
- Snout injury from glass impact
- Scale loss
- Bruising or internal bleeding
Most mild injuries heal on their own if water remains clean. Severe snout injuries may require professional care.
Nighttime Jumping
Arowanas are most vulnerable to sudden darkness or unexpected movement at night. Use a dim night light or moonlight setting to prevent panic jumps.
8. Proper Arowana Acclimation Guide
Arowanas are extremely sensitive to stress during transport and introduction to a new aquarium. Proper acclimation determines whether your fish adapts quickly or experiences shock, infections, or early mortality. Because Arowanas ship long distances and experience temperature and pH fluctuations, a structured acclimation process is essential.
This guide outlines the safest acclimation method, including temperature matching, drip acclimation, observation, and first-24-hour care to ensure a smooth transition.
Why Acclimation Matters
- Prevents sudden temperature or pH shock
- Reduces stress-related diseases
- Helps the fish adjust to new water chemistry
- Ensures stable breathing and buoyancy control
- Minimizes aggression and panic behavior
The Safe Acclimation Process (Step-by-Step)
- Turn off aquarium lights to reduce stress.
- Float the transport bag in the tank for 15–20 minutes to match temperature.
- Open the bag and roll down the edges to allow it to float upright.
- Add 1 cup of tank water to the bag every 5 minutes for 20–40 minutes.
- Use a clean net to gently transfer the Arowana into the tank.
- Never pour bag water into the aquarium (contains waste & ammonia).
- Leave lights off for 4–6 hours.
Acclimation Table (Quick Reference)
| Step | Duration | Notes |
|---|---|---|
| Temperature Floating | 15–20 minutes | Equalizes temperature safely |
| Water Mixing (Drip or Cup Method) | 20–40 minutes | Prevents pH shock |
| Net Transfer | 1 minute | Never use bag water |
| Lights Off Recovery | 4–6 hours | Reduces panic & jumping |
First 24 Hours After Acclimation
- Do not feed your Arowana (reduces stress and regurgitation)
- Keep the room quiet
- Ensure the tank lid is fully secured
- Watch for surface gulping, swimming imbalance, or heavy breathing
If you need essential equipment for safe acclimation, browse our selection here: Aquarium Equipment
9. Suitable Tank Mates for Arowana
Arowanas are large, predatory, and territorial surface swimmers. This means choosing tank mates requires careful planning. Ideal companions must be:
- Large enough not to be eaten
- Fast enough to avoid accidental aggression
- Active in different water levels (mid or bottom)
- Non-aggressive toward the Arowana
- Comfortable in large, stable aquariums
Below is a breakdown of compatible species monitored by hobbyists worldwide, along with their risk levels and behavior notes.
Best Tank Mates for Arowanas (Safest Options)
| Species | Compatibility | Notes |
|---|---|---|
| Silver Dollars | Very High | Fast, peaceful schooling fish; great for movement |
| Large Plecos | High | Bottom dwellers; help with algae; avoid aggressive variants |
| Freshwater Stingrays | High | Excellent bottom tank mates; require pristine water |
| Clown Loaches | Moderate–High | Fast but can be nippy; keep in groups |
| Datnoids | Moderate | Predatory but usually respectful of Arowanas |
| Large Catfish (e.g., Raphael, Synodontis) | Moderate | Peaceful bottom dwellers |
Species to Avoid
- Small fish (instantly eaten)
- Cichlids (may attack the Arowana’s fins & barbels)
- Overly aggressive catfish (Pictus, Red-Tails)
- Arowana + Arowana (high-fight risk unless pond-raised)
Key Tank Mate Rules
- Choose fish that occupy different water zones
- Feed Arowana well to reduce hunting behavior
- Avoid overcrowding
- Monitor aggression daily
If you plan on keeping rays with your Arowana, see our collection here: Freshwater Stingrays
For those seeking compatible Arowana species, browse: Arowana Fish for Sale
10. Arowana Growth Rate & Development
Arowanas are one of the fastest-growing freshwater fish in the aquarium world. Their growth rate depends on species, genetics, diet quality, tank size, and water stability. Most Arowanas grow several inches within months, especially when kept in optimal conditions.
This section outlines the average growth timeline, factors that influence development, and how to ensure your Arowana reaches its full potential without stunting or deformities.
Average Growth Rate (All Species)
- Baby (3–6 inches) — grows 1–2 inches per month
- Juvenile (6–12 inches) — fast linear growth continues
- Sub-Adult (12–20 inches) — growth slows but remains steady
- Adult (20–30+ inches) — gains are slower, stabilizing with age
Growth Chart by Age
| Age | Average Size | Notes |
|---|---|---|
| 1 Month | 4–6 inches | Rapid early-stage growth |
| 3 Months | 7–10 inches | Protein-rich diet essential |
| 6 Months | 10–14 inches | Tank upgrades may be needed |
| 1 Year | 16–22 inches | Sub-adult stage; color development begins |
| 2–3 Years | 24–30+ inches | Full maturity |
Factors That Influence Growth
- Diet quality: protein-rich pellets + varied foods
- Tank size: cramped tanks cause severe stunting
- Water quality: ammonia spikes immediately slow growth
- Genetics: premium bloodlines grow larger & stronger
- Stress levels: tank mates, noise, or reflections can inhibit growth
If your current tank is too small for healthy growth, explore upgrade options: Large Aquariums for Sale.
Signs of Stunted Growth (Danger)
- Thin body despite eating well
- Slow, unnatural growth pace
- Bent spine or reduced flexibility
- Small head relative to body
- Constant surface gasping or pacing
Stunting is usually permanent, which is why proper tank space and water conditions from day one are critical.
11. Common Arowana Diseases & Treatments
Arowanas are hardy but can quickly fall ill when exposed to poor water quality, parasites, stress, or incompatible tank mates. Knowing the early warning signs helps prevent severe infections and costly treatments. Most Arowana diseases are treatable if caught early.
Below is a consolidated disease reference chart, followed by treatment guidelines and prevention strategies.
Common Diseases Overview
| Disease | Symptoms | Causes | Treatment |
|---|---|---|---|
| Ich (White Spot) | White grains on body & fins | Stress, temp drops | Raise temp + aquarium salt |
| Fin Rot | Frayed or decaying fins | Dirty water, aggression | Improve water quality; antibacterial meds |
| Gill Curl | Gill covers curl outward | Ammonia or poor tank size | Fix water & upgrade tank; surgery in severe cases |
| Swim Bladder Disorder | Swimming sideways or sinking | Overfeeding, infections | Fasting + anti-bacterial treatment |
| Cloudy Eyes | Hazy or white eyes | Bad water, trauma | Clean water + vitamins |
| Drop Eye (Asian & Silver) | One/both eyes sag downward | High-fat diets, glass watching | No guaranteed cure; reduce reflections |
| External Parasites | Rubbing against surfaces | Contaminated tank mates | Salt + anti-parasitics |
Early Warning Signs
- Loss of appetite
- Erratic swimming
- Surface gulping
- Clamped fins
- Color fading
- Aggressive gill movement
How to Treat Diseases Safely
- Move the fish to a hospital tank if needed
- Increase aeration
- Test ammonia, nitrite, and nitrate immediately
- Use medication according to instructions
- Perform partial water changes (20–30%)
Prevention Checklist
- Stable water parameters
- Consistent feeding (avoid fatty foods)
- Large and appropriate tank size
- Quarantine new tank mates
- Secure lid to reduce injury-based infections
- Maintain strong filtration
Find quality equipment to reduce disease risks here: Aquarium Equipment
12. Frequently Asked Questions (FAQs)
Below are the most common questions new and seasoned Arowana keepers ask. This FAQ section provides quick, direct answers that can save you from common mistakes and help ensure long-term success with your fish.
1. How big do Arowanas get?
Most species reach 24–36 inches in captivity. Silver Arowanas can grow even larger, sometimes exceeding 40 inches in large indoor ponds.
2. What is the minimum tank size for an adult Arowana?
A minimum of 300–500 gallons is required for adult size. Tank length and width matter more than height.
3. Can Arowanas live with other fish?
Yes, but tank mates must be large, fast, and non-aggressive. See full tank mate list under: Section 9: Tank Mates.
4. Why is my Arowana swimming erratically?
Possible causes include:
- Ammonia or nitrite spike
- Sudden lighting changes
- Stress from tank mates
- Temperature fluctuations
5. Why is my Arowana losing color?
Common causes are aging, poor diet, water quality issues, and stress. Feeding a varied diet and maintaining low nitrates help maintain vibrant coloration.
6. How long do Arowanas live?
Arowanas can live 15–20 years with proper care. Some have been documented living over 25 years in optimal conditions.
7. Can I keep two Arowanas together?
Generally, no. Arowanas are territorial and will fight unless raised together in extremely large systems such as ponds.
8. Why does my Arowana keep trying to jump out?
Jumping is usually caused by:
- Stress or poor water quality
- Startle response to light or movement
- Small tank size
- Hunger or hunting instinct
9. Should I use live feeder fish?
Not recommended. Feeder fish carry parasites, and many species (goldfish) cause fatty liver disease in Arowanas.
10. What should I feed a baby Arowana?
Baby Arowanas require small, frequent meals such as:
- Cut shrimp
- Mini pellets
- Gut-loaded insects
For feeding equipment and accessories, browse: Aquarium Equipment.
13. Final Tips for Arowana Care
Arowanas are among the most rewarding fish to keep, but they demand space, consistency, and high-quality care. By following the guidelines in this comprehensive manual, you’ll be well on your way to raising a healthy, thriving dragon fish.
Key Takeaways
- Tank size matters most: Upgrade before it’s needed.
- Stable water = healthy Arowana: Test weekly.
- Feed smart: Use pellets as a staple and rotate proteins.
- Secure lids: Jumping accidents are the #1 cause of injury.
- Choose tank mates carefully: Avoid aggressive species.
- Observe daily: Early signs of illness are easy to miss.
Recommended Internal Resources
Keeping an Arowana is both an art and a science. With dedication, proper care, and the right setup, your Arowana can live a long, healthy, and visually stunning life—becoming the centerpiece of your aquatic collection.
Thank you for reading the Ultimate Arowana Care Guide.
Proper care is the most important factor in successfully keeping Arowanas in captivity, especially in large display aquariums where stability and consistency matter more than anything else.
For a deeper understanding of maintenance, feeding, and tank setup requirements, explore: