I Use Ro Water, I Have About 90 Lbs Of Lr Cultured. I Have A Nemo, Clown, Sailfin, 2 Firefish, Goby, A Citron Clown Goby And An Coral Beauty Fish, A Starfish, Snails And Corals. I Have Had This Nitrate Problem For About 3 Months And Can Not Get My Levels Down Below 40 I Have Algae In My Ref, With Live Rock As Well. I Have 5 Powerheads Going As Well. I Use Red Sea Salt. My Ph Fluctuates And I Add An Additive To Keep It Contstant At 8.3 But My Nitrate And Ammonia Are Undetectable. I Am About At My Wits End I Can Not Keep An Anemone Alive, But Everything Else Is Okay My Starfish Looks A Little Sick. I Did Have A Cucumber At One Time That I Can Not Find I Am Not Sure If I Still Have One. I Did Have Crushed Coral In My Tank And Took It All Out And Added Live Sand I Have 5 Bags On It In There. Please Help