so today I came home to no light. how much time do I have to get a replacement. 3 rbta some sps clown and maderin a few softies is all that is in it. thanks.
People go lights out for 3+ days to combat algae, so no problem for a few days.
As skunkmere stated, your clams and hard corals wont be using up cal/alk if no lights, so watch levels if dosing.