Do Corals eat Ich? I have a fellow reefer, who brought over some clean Cheato, from a grow out tank. Two months ago he got a Hippo Tang, ended up having Ich. Which it gave to his other fish. Hasn’t seen a bit of Ich in over 3-1/2 weeks. We pretty much have the same Coral, from swapping. I Quarantine just about all my fish, and inverts, fish get Copper Treatments, the Goby’s mostly just four weeks of observation. Wondering if Corals knocked out the Ich.