If you have it available, do a large water change will well aged SW
being sure to maintain treatment strength of what your using. The coppersafe is not going to have any effect on bacterial or fungal infections so I wouldn't use it. I don't know what you have been using to combat the C. irritans
thus far but you should be very careful of mixing meds. FWIW
, you could also try some Furacyn at 30 mg
as a last ditch effort. It's a 3 day treatment and usually fast acting and can be used with copper meds.
What have you been doing to treat the ich thus far?