In my 180 gallon FOWLR, my French Angelfish, emperor Red snapper and Bluehead wrasse all, since the last several weeks been scratching there bodies on the live rock. Since I started noticing this is August, I started treating the tank for ich but the fish are acting normal as usual. I do have a lot of water flow in the tank, I don't know if that is annoying the fish, or is this serious?