i have 2 oscars ,bala shark, red parrot, tinfoil barb , and a pleco. all in a 125 gal tank. the wierd thing is i would see ich on 1 of my oscar which is the tiger one. the rest of the fishes show no sign of ich at all. i tried raising the temp and alot of water changes is there any way to fix this? also i just notice that there is a small red or pink pimple on the side of his scale? it is the size of regular period. just a lil bigger. is there something wrong with him what can i do to fix this?