Unbelievable! I am having another isssue. This is an used tank I purchase two weeks ago. New sand. It came with rocks, fish and corals. My sand, rocks, and some corals are cover with these red stuff. Looks like red slime algae to me? I just put some Chemiclean in the tank. Let me know what you think. I know Dkh is very low, I am dosing Kent Marine pro buffer DKH. Dkh is around 6.5 this morning. I am slowly bringing up the dkh.







