Well, I zoomed in alot so it looks alot bigger. its a patch about 5 inches wide of a 60 inch tank but still. I dont have a phosphate test. I have mysis but I thought those were even worse cause theyre such small little shrimp and most of them fall to the bottom. I have two powerheads on for flow, one is a really nice one, but its at the top of the tank, so is the other. Dont want it all on the corals.