Giant Gourami With Arowana – Your Ultimate Tank Mate Success Guide

Written ByHoward Parker

Dreaming of a monster fish tank? I get it. There’s something truly breathtaking about watching huge, majestic fish glide through the water. And if you’re here, you’re probably captivated by one of the ultimate freshwater pairings: keeping a giant gourami with arowana.

It’s a common dream, but one that often comes with a lot of questions and a little bit of fear. Will they fight? Is my tank big enough? How do I even start? It can feel overwhelming, and the last thing you want is to create a stressful environment for these incredible creatures.

Well, you’ve come to the right place. I promise this guide will walk you through everything you need to know, step-by-step. We’ll cover why this duo can be so successful, how to build them the perfect home, and how to navigate the common problems that might pop up along the way. Let’s build your dream tank together!

Why This Pairing Works: The Surprising Synergy of Giants

At first glance, putting two potentially aggressive, massive fish together might seem like a recipe for disaster. But when you understand their natural behaviors, you’ll see why a giant gourami with arowana can be a match made in aquarium heaven.

The secret lies in how they use the tank. Arowanas are iconic surface-dwellers. They patrol the top third of the water column, always on the lookout. Giant Gouramis, on the other hand, tend to occupy the middle and lower levels. They are curious explorers, investigating caves and decor.

This natural separation means they aren’t constantly bumping into each other or competing for the same territory. It creates an immediate sense of peace. Think of them as upstairs and downstairs neighbors who politely nod as they pass each other.

One of the key benefits of giant gourami with arowana is their complementary personalities. Arowanas can sometimes be skittish, but the calm, deliberate presence of a giant gourami often has a soothing effect, acting as a “dither fish” that signals the environment is safe. This dynamic creates a more balanced and visually stunning aquarium.

The Essential Tank Setup: Building Their Forever Home

Let’s be crystal clear: this is not a pairing for a small tank. Success starts and ends with providing enough space. This section of our giant gourami with arowana guide is the most important one. Don’t skimp here!

Tank Size – The Non-Negotiable Foundation

We’re talking about fish that can each reach 2-3 feet in length. The absolute bare minimum tank size for young specimens is 300 gallons (about 1135 liters). However, for fully grown adults, a tank of 500 gallons or more is truly what you should be aiming for.

Why so big? It’s not just about swimming room. A larger volume of water is more stable, dilutes waste more effectively, and gives each fish enough personal space to reduce territorial stress. A cramped giant is an aggressive giant.

Filtration: The Heart of Your Monster Tank

These fish are big eaters, which means they produce a massive amount of waste. Your filtration system needs to be a powerhouse capable of handling an enormous bioload (the total waste produced by your tank’s inhabitants).

A simple hang-on-back filter won’t cut it. You should be looking at:

  • Large Canister Filters: Consider running two or more high-capacity canister filters.
  • Sump Systems: This is the gold standard for monster fish tanks. A sump is essentially a second tank hidden below the main one that holds all your filtration media, heaters, and pumps, maximizing efficiency and keeping the display tank clutter-free.

Your goal should be to turn over the entire volume of your tank at least 4-6 times per hour. For a 300-gallon tank, that means a filtration system rated for 1200-1800 GPH (gallons per hour).

Aquascaping for Giants

Decorating a tank for these titans is a balancing act. The Arowana needs vast, open water at the top for swimming and turning, so avoid tall pieces that reach the surface. A secure, heavy lid is also absolutely mandatory, as Arowanas are notorious jumpers.

The Giant Gourami will appreciate some structure in the lower half of the tank. Use large, smooth pieces of driftwood or rounded boulders to create caves and break up lines of sight. This gives them a place to retreat and helps prevent territorial squabbles. Make sure any decor is too heavy for them to move and has no sharp edges.

Water Parameters and Maintenance

Both fish are quite hardy, but they thrive in clean, stable water. Aim for these general parameters:

  • Temperature: 75-82°F (24-28°C)
  • pH: 6.5-7.5
  • Hardness: Soft to moderately hard

The most critical part of their care is a strict maintenance schedule. You should be performing large water changes of 30-50% every single week. This is non-negotiable for keeping nitrates low and your fish healthy.

Your Complete Giant Gourami with Arowana Care Guide

You’ve got the tank, the filtration is humming, and you’re ready to bring your fish home. Let’s cover the giant gourami with arowana best practices for a long and happy partnership.

Choosing Your Fish: Size and Temperament Matter

The best way to ensure harmony is to purchase both fish as juveniles of a similar size (around 4-6 inches). This allows them to grow up together, establishing a pecking order naturally without the intense aggression that can occur when introducing a new fish to an established adult’s territory.

When selecting your fish, look for active individuals with no visible signs of injury, clear eyes, and a healthy appetite. Don’t be afraid to ask to see them eat at the fish store!

The Introduction Process

When it’s time to add them to their new home, don’t just dump them in. Float their bags in the tank for 15-20 minutes to equalize the temperature. Then, slowly add small amounts of tank water to their bags over the next 30-45 minutes to acclimate them to your water parameters.

A pro tip is to have the decor arranged in a new way right before you add them. This resets any territorial markers and forces both fish to explore their new environment as equals.

Feeding Your Titans: A Diet for Health and Harmony

A well-fed fish is a happy fish. Hunger can often lead to aggression, so providing a varied, high-quality diet is crucial. This is a key part of how to giant gourami with arowana successfully.

  • For the Arowana (Carnivore): Offer a staple diet of high-quality floating pellets or sticks designed for carnivorous fish. Supplement this with treats like frozen shrimp, krill, and earthworms. Avoid feeding live feeder fish, as they can introduce disease.
  • For the Giant Gourami (Omnivore): These guys will eat almost anything! A high-quality pellet is a great base, but they need vegetable matter. Offer them blanched zucchini, spinach, and peas regularly. They will also enjoy the same meaty foods as the Arowana.

Feed them once or twice a day, providing only what they can consume in a couple of minutes to avoid polluting the water.

Common Problems with Giant Gourami with Arowana (And How to Solve Them!)

Even in the best setups, you might encounter a few bumps in the road. Don’t panic! Most issues are easily solved with a bit of observation and adjustment.

Dealing with Aggression and Territorial Disputes

You might see some chasing or nipping, especially as they mature. If it becomes constant, it’s a sign of stress. First, double-check your tank size and water quality. Often, aggression is a symptom of a cramped or dirty environment.

If those are fine, try rearranging the decor to break up their territories. You can also add more “dither fish”—large, fast-moving, peaceful species like Silver Dollars or Tinfoil Barbs—to spread out any aggression.

Size Discrepancy Issues

Sometimes, one fish just grows faster than the other. If the Arowana significantly outpaces the Gourami, it might start to view its tank mate as a potential meal. This is why starting them at the same size is so important. If a large size difference develops, ensure both are getting enough food. The faster-swimming Arowana can sometimes out-compete the Gourami for food at the surface.

Health Concerns in Large Tanks

Maintaining pristine water quality is your number one defense against illness. Common issues in large fish include Hole-in-the-Head (HITH) disease, often linked to poor water conditions, and swim bladder problems. Treating a sick fish in a 500-gallon tank is incredibly difficult, so prevention through diligent maintenance is key.

Sustainable and Eco-Friendly Best Practices

As keepers of these magnificent animals, we have a responsibility to be mindful of our impact. Embracing sustainable giant gourami with arowana care is easier than you think.

First, always try to source captive-bred fish. This reduces the pressure on wild populations, which are threatened in some areas. Many quality breeders now offer both Arowanas and Giant Gouramis that have been raised in an aquarium environment.

Think about your resource use. An eco-friendly giant gourami with arowana setup can include using energy-efficient LED lighting and pumps. When you do your weekly water changes, don’t just pour that nutrient-rich water down the drain! Use it to water your houseplants or garden—they’ll love it.

Finally, remember that these fish can live for 20 years or more. This is a long-term commitment, not a temporary hobby. Being a sustainable aquarist means planning to provide a healthy, happy home for their entire lives.

Frequently Asked Questions About Giant Gourami with Arowana

What is the minimum tank size for a giant gourami and an arowana?

The absolute minimum for young fish is 300 gallons. For happy, healthy adults with enough room to thrive, you should plan for a tank of 500 gallons or more. Bigger is always better for this pairing.

Can I keep other fish with them?

Yes, you can! The best tank mates are other large, robust, and relatively peaceful species that occupy different areas of the tank. Great choices include large Plecos (like the L-25 Scarlet Cactus Pleco), Datnoids (Tiger Fish), and large, peaceful catfish that stick to the bottom.

Which should I add to the tank first, the gourami or the arowana?

The ideal method is to add them at the same time when they are both juveniles of a similar size. This prevents either fish from establishing the entire tank as its territory before the other arrives, leading to a more peaceful cohabitation.

My giant gourami is chasing my arowana. What should I do?

First, check your water parameters and ensure the tank is large enough. Aggression is often the first sign of stress from environmental factors. Try rearranging the decor to break lines of sight. If the behavior persists, ensure both are well-fed. Sometimes, a short “time out” using an egg crate divider can help reset their dynamic.

Your Journey to an Incredible Monster Tank

Keeping a giant gourami with arowana is one of the most rewarding experiences in the freshwater aquarium hobby. It’s a challenge, absolutely. It requires a significant investment in space, equipment, and time.

But the payoff is a living centerpiece unlike any other—a dynamic, powerful, and surprisingly peaceful display of nature’s beauty. By focusing on the fundamentals—a massive tank, powerful filtration, a quality diet, and a commitment to clean water—you are setting yourself up for incredible success.

Don’t be intimidated. You have the knowledge now. Go forth and build the monster tank of your dreams!

Howard Parker
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