Betta Fish Tank Complete Guide: Setup, Care, Mates
A bowl on a countertop is the single most common reason bettas die young in Singapore homes. This betta fish tank complete guide replaces the pet-shop myths with the numbers that actually keep Betta splendens healthy for three to five years — the right volume, a stable temperature held against an air-conditioned bedroom, gentle flow for those long fins, and a realistic view of tank mates. Written by the team at Gensou Aquascaping, 5 Everton Park, with over 20 years of hands-on experience guiding SG keepers from first fish to display-grade planted tanks.
Minimum Volume: Why 5 Gallons Is the Floor
A betta needs at least 5 US gallons, roughly 19 litres, and larger volumes are easier to stabilise, not harder. Small glass bowls under 10 litres swing in pH, ammonia and temperature within hours, which is why fish in them usually last six months rather than four years. A dedicated betta tank in the 19-38 litre range gives you swimming lanes, planting space and thermal mass. Beginners who pick a 10-gallon setup almost never regret the extra volume.
Temperature — The AC Problem Singapore Keepers Miss
Bettas are tropical, with a target range of 26-28 degrees Celsius. Singapore days sit well inside that band without equipment, but an AC’d bedroom that drops to 22 degrees overnight pushes bettas into lethargy, finrot and slow immune failure. A 25W preset aquarium heater with a guard costs SGD 25-45 at Petopia or Nature Pet and is non-negotiable for any room that runs aircon after 10 pm. Verify the dial against a separate digital thermometer, because preset heaters drift.
Filtration: Gentle Flow, Fully Cycled
The long flowing fins on a male betta turn a strong HOB or canister outlet into a treadmill. You want biological filtration without the current, which is why a sponge filter on a small air pump, or a nano HOB with the flow baffled by a piece of filter floss, is the SG standard. Check the filter selection for models rated under 200 LPH on tanks up to 30 litres. Cycle the filter with ammonia for four to six weeks before adding your fish — warm SG ambient speeds this compared to temperate guides.
Water: PUB Tap Is Already Halfway There
Singapore PUB water runs soft at GH 2-4 and KH 1-2, slightly acidic, and chloramine-treated. That profile is close to the blackwater rice paddies bettas evolved in, so no remineralisation is needed — you simply treat chloramine with a dechlorinator rated for it. A bottle of API Betta Water Conditioner handles a year of weekly water changes on a 20-litre tank. Skip the “betta salt” products; bettas are not brackish fish and chronic salt use damages the slime coat.
Aquascape: Soft Surfaces, Rest Platforms, Cover
Bettas sleep draped on leaves near the surface, which means a planted tank is closer to their biology than a bare-bottom hospital look. Anubias on driftwood, floating frogbit, java fern and a large Indian almond leaf cover 60 per cent of the surface and leave clear swim lanes. Anything sharp — plastic plants with hard edges, craft-store resin ornaments — rips fins within days. Test every decor piece against pantyhose before it goes in; if the fabric snags, so will the fins.
Substrate and Plants
Fine sand or rounded black gravel, 3-4 cm deep, supports low-light plants and hides the waste colour. If you want a planted betta tank, start with anubias, java fern, cryptocorynes and bucephalandra — they handle GH 2 and the gentle flow bettas need. Dose a plant-safe fert like JBL NanoBiotopol Betta at 1 ml per 10 litres weekly. Skip CO2 injection; it is unnecessary for low-tech betta setups.
Feeding: Protein First, Little and Often
Bettas are obligate carnivores with tiny stomachs roughly the size of their eye. Two to three pellets twice daily is enough — overfeeding is the leading cause of bloat and constipation in SG tanks. Rotate a colour-enhancing staple like Hikari Betta Bio-Gold with frozen bloodworm or brine shrimp twice a week. One fasting day per week prevents the swim-bladder episodes that panic new owners.
Tank Mates: Males Alone, Community Carefully
Two male bettas in one tank fight until one dies — this is not negotiable and no amount of space fixes it. A male in a 38-litre planted tank can share space with a small group of pygmy corydoras, a nerite snail and a few amano shrimp, if you introduce them before the betta. Guppies with flowing tails trigger aggression; neon tetras usually ignore the betta and vice versa. Females can form sororities of five-plus in 75 litres, but the setup is advanced, not beginner.
Weekly Maintenance Routine
Twenty-five per cent water change weekly, gravel vacuum the front half, wipe the glass, rinse the sponge in tank water — not tap. Top up with conditioned PUB water matched to within 1 degree Celsius of tank temperature. Test nitrate monthly and aim under 20 mg/L. A tank this small rewards consistency over heroic deep cleans; fish in stable water live years longer than fish in sparkling water changed chaotically.
Where to Buy in Singapore
For the fish itself, Petopia in the east and Polyart along Aljunied carry veil-tail and halfmoon bettas at SGD 8-25. Show-grade plakats from Carousell SG breeders run SGD 30-80 and often outlive pet-shop stock because they are line-bred for vigour. Aquarium Iwarna in the west stocks wild-type betta species for experienced keepers. C328 in Clementi and Nature Pet have the tanks, heaters and conditioners in one stop — useful when setting up from scratch.
Related Reading
emilynakatani
Still Have Questions About Your Tank?
Drop by Gensou Aquascaping — most walk-in questions get answered in under 10 minutes by someone who has set up hundreds of tanks.
5 Everton Park #01-34B, Singapore 080005 · Open daily 11am – 8pm
