I recently medicated my 180 for ich as a few fish had it (not the 6 inch tigrinus) using a copper product, fritz mardel quick cure. The tigrinus seems to have had a bad reaction and is swimming around abnormally and stopped eating. I did 2 separate 25% water changes in the past 3 days and changed the carbon to take the copper out of the water and the tigrinus is still acting funny. I think he was poisoned from the copper product. Anything else I can do to save him????