offminded

how long should i leave my lights on in my 55 gallon FOWLR? I have 216 watt T 5s.

agsansoo

6 - 10 hours is good. It depends on you, as long as you like.

miker

How about Moon-lighting for after hours viewing? Are the Fish going to be fine?

sgould

Yep...moonlights will not bother them.

GreenMan13

If the tubes have different switches or plugs you can have some on for 10 hours and the rest on for only 6 or something like that. A lot of people do this to simulate changes in sun intensity.