my nano (with 2 PC atinic, two PC triton 9 watts each) is growing a fair amount of red slime algae. It is also growing coraline. I think maybe i am leaving the lights on too long (12-14 hours)...tanks is jsut about 3 months old with 10 lbs premium live rock, live sand about 1 1/4 inch thick and only 4 hermit crabs to nice size snails, and a few mushrooms....any ideas on the cause>



