Which size for my tank?

Heaters

Count 3 to 5 watts per gallon in a heated room. Every DaToo heater lists its gallon range on its page.

Lights

Clip-on lights fit open rims up to 0.25 in. Bracket lights are sold by outside tank length.

Filters

Choose the model whose gallon range includes your tank; when between two, pick the larger and turn the flow down.