I have a 30 gallon tank with a peguin 200 filter and 5 cherry barbs, 3 diamond tetras and 3 peppered cories. I just got the 3 diamond tetras from a lfs and they infected my tank with ich. I was going to finish the school of cories in week but that is not possible as of now. I have been treating the ich with api super ick cure and it seems to be working but now some of my cherry barbs have a little outline of white stuff on thier fins. My cories and tetras seem fine even though i dosed full dose. I need to know what to do about the white stuff or if its just a side effect of the meds.