Originally Posted by adacaro
I wanted to ask. How long can you have your lights on in order not to affect your corals and alge problem
Well, that's kind of a loaded question, because you do want your lighting to affect your corals and even algae (coraline), but in a positive way. The duration you have your lights on is going to depend on the type of lights, the type of corals and their placement in the tank. I think the average would be to have lighting for 12-15 hrs, with the actinics coming on an hour before the 10k-20k and then going off an our after as well - to simulate somewhat of a sunrise sunset affect.