have a recent problem with hair algae. have many snails.mithrax crabs, 1 powder blue tang, and some hermit crabs. this is in a 180 gal reef tank no phosphates, no nitrate, no nitrite, ph 8.2 salt 1.023-024 temp 77-78 always lights on about 6 hours a day. cant seem to get rid of it. getting ready...