Setting Up a Betta Tank the Right Way

There's no single "correct" way to set up a betta tank — experienced keepers will tell you that the hobby is full of different approaches, and many of them work. But after 10 years of trial and error, we've learned what we'd do differently if we were starting over. This guide is what we'd tell our younger selves.

Tank Size Matters

One of the most persistent myths in the betta hobby is that bettas can thrive in small tanks or bowls because they come from rice paddies. While it's true that bettas inhabit shallow, slow-moving water in the wild, rice paddies are vast, open environments — not tiny enclosed containers. In a small tank, water parameters fluctuate rapidly, toxins build up quickly, and there's simply not enough space for a betta to express natural behaviour.

For beginners, we recommend a minimum of 20 litres. A tank this size is far more stable, easier to cycle, and gives your betta room to swim, explore, and thrive. It also provides enough volume to support a planted setup and a small filter without constant intervention. Bigger is always better — but 20L is a solid, manageable starting point.

Start with Aqua Soil

If we could go back and change one thing, it would be switching to aqua soil from day one. Aqua soil naturally softens and slightly acidifies the water, mimicking the soft, tannin-rich rivers and rice paddies that bettas call home in Southeast Asia. It's also a powerhouse substrate for root-feeding plants, providing a rich nutrient base that keeps your aquascape thriving. Beyond function, it simply looks beautiful — dark, natural, and far more fitting for a betta display than coloured gravel.

Build a Diverse Planted Environment

Plants aren't just decoration — they're a critical part of a healthy betta ecosystem. Different plant types serve different roles, and having a mix is key to a balanced tank.

Stem Plants like Ambulia (Limnophila sessiliflora), Rotala, and Wisteria are fast-growing and excellent at absorbing excess nutrients from the water column. They help keep nitrates in check and provide dense cover for a betta to explore and hide in.

Root Feeders & Carpeting Plants like Cryptocorynes (Crypts) draw nutrients directly from the substrate, making them a perfect pairing with aqua soil. Carpeting plants add depth and a lush, natural floor to the tank.

Large-Leaf Plants like Anubias and Java Fern are essential for bettas specifically. Bettas are labyrinth fish — they breathe air from the surface and love to rest near the top of the tank. Broad leaves give them a place to lounge, reducing stress and encouraging natural behaviour. These plants also absorb nutrients from the water column, contributing to overall water quality.

The diversity of plant types matters. Fast growers, slow growers, root feeders, and water column feeders all work together to create a self-regulating ecosystem that's more stable and easier to maintain long-term.

Hardscape: Driftwood & Rocks

Driftwood and rocks aren't strictly essential, but they elevate a betta tank from a simple setup to a well-rounded natural ecosystem. Driftwood releases tannins into the water, further softening it and adding the warm, amber tones of a betta's natural habitat. It also provides anchor points for plants like Anubias and Java Fern, which attach to hardscape rather than substrate.

One important note: always check that any rocks or wood you add have smooth surfaces. Bettas have long, flowing fins that can easily snag and tear on sharp edges — a torn fin is not only stressful for the fish but can become a site for infection. When in doubt, run your hand over the surface. If it feels rough or sharp to you, it'll be rough to your betta.

The Importance of Botanicals

Botanicals — seed pods, leaves, bark, and husks from natural sources — are one of the most underrated additions to a betta tank. Items like Indian Almond (Catappa) leaves, Alder cones, Cholla wood, and various seed pods release tannins and humic acids as they break down, naturally lowering pH and softening water. This creates what's known as a "blackwater" environment, closely replicating the conditions bettas evolved in.

Beyond water chemistry, botanicals provide enrichment. They create microhabitats, encourage natural foraging behaviour, and give bettas places to investigate and interact with their environment. The biofilm that forms on decomposing botanicals is also a nutritious supplemental food source. If you haven't explored botanicals yet, they're well worth adding to your setup.

Filtration: Slow & Gentle

Bettas come from slow-moving or still waters — they are not built for strong currents. A powerful filter will stress your betta, cause fin damage from constant buffeting, and make it difficult for them to swim comfortably. Choose a gentle filter: a sponge filter, a small hang-on-back, or an internal filter on its lowest setting.

The primary role of your filter isn't just mechanical — it's biological. Filter media houses the beneficial bacteria that are the backbone of a healthy aquarium. This brings us to one of the most important concepts in fishkeeping.

Understanding the Nitrogen Cycle

The nitrogen cycle is the process by which harmful fish waste is converted into less harmful compounds by beneficial bacteria. Here's how it works:

• Fish produce ammonia through waste and respiration. Ammonia is highly toxic, even in small amounts.
• Nitrosomonas bacteria colonise your filter media and convert ammonia into nitrite — still toxic, but less so.
• Nitrobacter bacteria then convert nitrite into nitrate, which is far less harmful and is absorbed by your plants.

A tank is considered "cycled" once both bacterial colonies are established and ammonia and nitrite consistently read zero. This process typically takes 4–8 weeks in a new tank. Never skip this step — adding a betta to an uncycled tank is one of the most common causes of preventable fish loss. You can speed up the cycle by using established filter media, bottled beneficial bacteria products, or by "fish-in cycling" very carefully with daily water changes and close monitoring.

Water Treatments

Water Conditioner is non-negotiable. Tap water contains chlorine and chloramines that are lethal to fish and will destroy your beneficial bacteria colony. Always treat tap water with a quality dechlorinator before adding it to your tank — whether for the initial fill or regular water changes.

Liquid Fertiliser keeps your plants healthy and thriving. Even with a nutrient-rich substrate like aqua soil, the water column benefits from regular liquid fertiliser dosing. Healthy plants mean better nutrient uptake, which means better water quality for your betta. Look for a balanced all-in-one liquid fertiliser and dose according to your plant load.

Heating: Bettas Are Tropical Fish

This one is non-negotiable. Bettas are tropical fish that require a stable water temperature between 26–28°C (79–82°F). In Australia, even warm summers can see overnight temperature drops that stress bettas and suppress their immune systems. A reliable, adjustable heater is essential — not optional. Aim for consistency; fluctuating temperatures are just as harmful as cold water. A thermometer is a worthwhile addition to monitor your tank daily.

Feeding Your Betta

Bettas are carnivores with a preference for protein-rich foods. A varied diet keeps them healthy, vibrant, and engaged.

Pellets are the most convenient staple. Choose a high-quality betta-specific pellet with a protein-rich ingredient list (fish or shrimp meal as the first ingredient). Feed small amounts — bettas have stomachs roughly the size of their eye, and overfeeding is a common mistake that leads to bloat and poor water quality.

Flake food can be used as a supplement but shouldn't be the primary diet. Many flakes are lower in protein and can break apart and foul the water quickly.

Live and frozen foods are where bettas truly thrive. Blackworms are an exceptional live food — highly nutritious, easy to culture at home, and bettas go absolutely wild for them. Daphnia and brine shrimp are also excellent options that can be fed regularly.

A word on frozen bloodworms: bettas love them, but they should be treated as an occasional treat rather than a dietary staple. Consistent feeding of frozen bloodworms has been linked to bloat, blocked intestinal tracts, and dropsy-like symptoms — likely due to their low fibre content and the way they're processed. Offer them once a week at most, and prioritise blackworms, daphnia, or brine shrimp as your go-to live and frozen options.

Final Thoughts

Setting up a betta tank the right way takes a little more time and thought upfront, but the result is a thriving, low-maintenance ecosystem that you'll genuinely enjoy watching every day. Aqua soil, diverse plants, gentle filtration, a cycled tank, botanicals, and a good diet — these are the foundations. Get these right, and your betta will reward you with years of personality, colour, and life.

Have questions about your setup? Reach out to us — we're always happy to help.