I have had brown algae/diatom bloom for several weeks. I purchased a denitrator that has those levels well in check. All other parameters are WNL. In a 55 gal acrylic tank, have a CPR 2plus filter and protein skimmer, a powerhead on the opposite side, and a carbon biofilter in between with purigen added. A compact light is on 12-14 hours a day. What light cycle shoud I be using? There are only a couple of narssarius, bumblebees and three scarlet hermits in the tank. The purple corraline alge is starting to grow along with some green, but mostly the awful brown stuff. The tank has 25lb of live rock, some red kelp and a fan plant. I am, of course anxious to add seahorses, but am heaitant to even add more snails till this is under control. Please advise! Thanks much for your help.