[CT Trooper]

I have a 55 gal. set up w/ 120 lbs lr, 60 lbs live sand. The tank has been up and running for about 10 weeks +/- and I cannot keep my fish alive. Currently I have 2 purple/blue pseudichromis (sic) 1 algae blenny, and 2 clown fish. Everytime I put in a nicer fish it lasts 3-4 days and come morning I find it on the bottom dead. Water checks out fine by me doing it and my lfs. I feed once a day flake and/or brine shrimp. I am ready to pull my hair out. Help!!!!! Just this week I lost a Korean angelfish and a brown tang. Have also lost 2 tomato clowns at different times, yellow tang, coral beauty, etc etc etc.

P.S. I have am magnum pro canister/dual bio wheel set up and a sea clone protein skimmer.