I have been strugling with water perameters mainly phosphate and NitrAte, for the past 2-3 months. I need help! I have tried the following: Skim heavier (wet), reduced my feeding schedule, Got a new can filter, and 30g waterchanges every 3-4 days, siphon out my substrate for detritus (only a quarter with each water change) cleaned out sump, and clean filters every time I do a WC! My Nitrates are still high (20-40ppm) and phosphates are .25ppm. My Lfs told me that maybe i was over feeding. So with that being said, How do I know if I'm over feeding? Right now i feed 2 frozen cubes once a day and twice a day alternating every other day! I am feeding a 8" blue tang, 5" blue jaw Trigger, 3 occelarus clowns, 2 dominoe damsels, 1 fuji blue devil damsel, 1 Royal Gramma, and 1 Coral Beauty, and 2 Cleaner shrimp. I also have other livestock but they are inverts so feeding is different! Please before any one gets on me I already know that's a lot of livestock!!