How to Set Up Betta Fish Tank Guide: First Week Routine

A betta fish (Betta splendens) deserves more than the tiny cups they are sold in. A 19-litre planted tank costs under SGD 100 to set up in Singapore and turns a stressed cup-fish into a curious, interactive display pet within two weeks. This how to set up betta fish tank guide from Gensou Aquascaping at 5 Everton Park covers the first-week routine — tank, filtration, substrate, plants, cycling — and the specifics of Singapore tap water that make bettas one of the easiest tropical fish to keep here.

Choosing the Tank

A 19-litre (5 US gallon) tank is the practical minimum; a 40-litre (10-gallon) gives room for planted decor and reduces water change frequency. A 30 by 30 by 30 cm cube from C328 Clementi runs SGD 45-60 and suits a betta well. Low height (under 35 cm) matters because bettas breathe at the surface using a labyrinth organ. Tall narrow tanks stress them because swimming up for air is exhausting.

Equipment List

Sponge filter driven by an air pump (SGD 15 from Qian Hu or Shopee), small LED light fixture (Chihiros C series or similar, SGD 35-50 from N30 Tank), thermometer (SGD 5-8 from C328 Clementi), bag of inert aquarium sand or ADA Amazonia soil (SGD 20-35). No heater needed — Singapore ambient 28-32°C sits within the betta comfort range (24-29°C) year-round except in air-conditioned rooms where a 25W heater may occasionally kick in.

Rinse Everything

Rinse the tank with plain tap water, no soap. Rinse substrate in a colander under running tap water until the rinse runs clear — this takes 10-15 minutes for sand, up to 30 minutes for dusty gravel. Aquasoil is the exception: do not rinse because it is pre-prepared. Rinse the sponge filter briefly to soften the foam, then install.

Hardscape and Planting

Bettas love cover. A piece of driftwood (SGD 8-15 from C328) creates the overhang they will flare at their own reflection behind. Live plants matter more than decoration: Anubias nana tied to driftwood, Cryptocoryne wendtii rooted in substrate, and a surface plant like Amazon frogbit or red root floater for shade. All three handle Singapore tap water (GH 2-4, pH 6.8-7.2) without fertiliser supplementation initially.

Filling and First-Day Water

Fill from the kitchen tap using a 20-litre Ikea bucket (SGD 8) pre-treated with Seachem Prime dechlorinator. Pour water over a plate placed on the substrate to avoid disturbing the scape. Start the air pump; confirm bubbles rise steadily from the sponge filter. The first-day water will be slightly cloudy — bacterial bloom, not a problem. It clears within 48-72 hours.

Cycling Before Fish

Do not add the betta yet. The nitrogen cycle needs to establish, which takes 2-4 weeks in a fishless setup. Shortcut: add a handful of filter media from an established tank (ask a local shop or fellow hobbyist), or dose bottled nitrifying bacteria (Seachem Stability, SGD 15-20). Dose ammonia to 2 ppm using pure ammonia solution (SGD 8 online) and test daily. When both ammonia and nitrite drop to zero within 24 hours of dosing, the cycle is complete.

Acclimating the Betta

Buy from a reputable local shop (Polyart, C328, Qian Hu) where stock looks active and unblemished. Float the bag on the tank surface for 15 minutes to equalise temperature. Open the bag, add a small cup of tank water every five minutes for 30 minutes. Net the fish into the tank; never tip bag water in, because pet-shop water quality is usually worse than your cycled tank. Turn the light off for 24 hours to reduce stress.

First Week Feeding

Feed one pellet at a time, watching the fish eat it, for the first three days. Hikari Betta Bio-Gold or New Life Spectrum Betta pellets (SGD 8-12 from any local shop) are nutritionally complete. Two to four pellets per day is sufficient. Overfeeding is the single most common cause of bloat and swim bladder issues in bettas. A hungry betta is a healthy betta; fat bettas die young.

Observing Behaviour

A healthy betta flares at its reflection within days, builds a bubble nest at the surface, explores the tank and rests on leaves. Clamped fins, lying on the substrate or hiding constantly suggests stress — usually water quality (test ammonia, nitrite) or temperature (check thermometer). Fin-biting happens in bare tanks; add more cover. First-week observation builds your baseline for spotting issues later.

First Water Change

Seven to ten days after adding the betta, do a 20 percent water change. Use dechlorinated tap water matched to within 1°C — PUB supply usually lands this without effort. Siphon lightly around the substrate with a small gravel vacuum (SGD 12-18 from Shopee). Do not break down the scape to “deep clean” — bettas dislike rearrangement and may refuse food for days afterwards.

Related Reading

• How Many Fish in 5 Gallon Tank Guide
• Betta Fish Care Guide Singapore
• Nano Tank Stocking Guide Singapore
• Sponge Filter Guide Singapore
• Aquarium Cycling Guide Singapore