I'm currently using metro + focus. All my fish caught ich because I didn't quarantine a Kole Tang. The tang is not doing so hot...but my clownfish..hawkfish..basslet are doing ok. I'm treating the other tanks as well just because. It's worth a try to try to kill the bugs that cause it but I think it would be necessary to leave the tank fishless for awhile...until proper quarantine methods can be managed.