okay, I changed lights about a 6weeks ago, 2 weeks ago changed to LS from CC, it is diatoms. I have snails and crabs, but they stay mostly on the LR and glass. I only feed every other day, only two fish, 1-2 inch yellow tang, and a 1-2 inch maroon clown. how long should the lights be on. I have a RTBA, and several other corals.