With an aquarium calculator, you can approximate heater size and temperature level targets

https://aquarium-size-calculatorjfoh904.bearsfanteamshop.com/don-t-make-this-mistake-when-it-comes-to-your-aquarium-measurements-calculator

With an aquarium calculator, you can estimate heating system size and temperature targets. Make much safer choices for tropical, cold-water, or planted tanks.