I just read your profile if it is still good and you are feeding this
Mysis Shrimp, Shrimp Brine, Saltwater Variety Pack try feeding a dry food like a Nutrafin complete first soak in water then feed like brine shrimp. When you feed frozen foods it is more mushy and dirties the water more than a food that the fish can eat more of. Feed less more times so there is less waste.
Is this all the CUC you have 7 Turbo Snails, 1 Emerald Crabs, 1 Cleaner Shrimp?
If you have a sandbed you could add 12 ceriths and 12 nassarius snails.