I am encountering the toughest ich I have EVER seen in almost 40 yrs of fishkeeping. I have tried every trick, treatment, voodoo, and blackmajic on it that I can think of, and it cannot be destroyed. I have used heat, heat with salt, malachite green, formalin, prazi, victoria green(a&B) Meth blue, potassium permanganate and none of it has even slowed down the Tomite stage of the parasite. I am totally blank on this strain of ich. I am in the process of using copper now, didn't want to due to the tank being planted. At the first point I noticed a few spots on the fish, I started treatment with Quick Cure(M.green-formalin) blend. A few more spots showed up, and I figured the next batch of swarmers that hatched out the meds would get them. WRONG!!! Within 3 days some of the fish looked like they were rolled in salt, and it has continually gotten worse every cycle despite all the treatments. If the copper don't work I will euthenize the fish, and nuke the tank with hot bleach, and start over.