sick yellow tang

[mtfish]

Thanks for the reply. Ammonia reading is inbetween 0 and 0.25. Nitrite still 0. Nitrate went up to 20. But I lost the battle and have lost the tang. I looks like it just starved to death, but had been eating well 2 days ago. Before I go forward with more fish to stock, I need to get a handle on filtration. When I started the tank I had a canister filter, but am trying to go strictly with live rock and sump system. Until I get water chemistry stable, I am at a stand still. Again thanks for the reply.