Proper Betta Tank Care: Step-by-Step Guide Choose the right tank Select a minimum 5-gallon (19 L) tank per betta to ensure stable water conditions and swimming space. Use a tank with a lid to prevent jumps. Betta fish (Visual illustration generated using AI) Condition the water Fill the tank with dechlorinated water at room temperature (75–80°F / 24–27°C). Use a water conditioner to remove chlorine and chloramines. Avoid cold tap water directly. Install and set equipment Place a gentle filter to maintain water quality without strong currents. Add a heater to keep temperature constant. Include a thermometer for monitoring. Prepare the substrate and decor Add smooth substrate and live or silk plants for hiding spots. Avoid sharp decorations that can damage fins. Provide floating plants or leaves for resting near the surface. Cycle the tank before introducing the fish Establish the nitrogen cycle (ammonia → nitrite → nitrate) over 2–6 weeks or use bottled bacteria. Test water parameters: ...