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

https://fish-tank-size-calculatorfaji007.quillnesty.com/posts/how-fish-tank-water-calculator-is-a-secret-life-secret-life-of-fish-tank-water-calculator

With an aquarium calculator, you can approximate heating unit size and temperature level targets. Make much safer options for tropical, cold-water, or planted tanks.