Isnt cyano red slime?? When we check all our levels they are fine. Nitrates-nitrites,ph,calcium,ammonia,hardness,phosphates. all are good, I feed the fish once a day alternating flakes and brine shrimp. What is a nutrient?? I know that sounds dumb, but i thought it was nitrates. We change our h2o once a month 15 gallons. and we have a "Rapids Pro" all in one package, with Large capacity filter,rapids surface skimmer overflow, aqua lifter, protein skimmer, rapids water pump and stellar plus air pump. Is that good? We have 5 of turbo snails and were told lawnmower blennys would eat it, but they're not.