New Lights

[FishingBob]

I just replaced my eight PC's with 4 T5's and 3 MH. The lighting is so much different. A friend told me not to leave the lights on very long that the change would shock my corals. Is this true or not?

 

[HippieFish]

It is true, you've increased the light amount by a great deal. There are a couple of ways to go about this. Limit the photoperiod, raise the lights, or put window screening between the tank and the lights.