How do you tell the difference between fungus, columnaris, and fin rot? And how do you treat them? I thought my rams had ich but on closer inspection it looked a little fuzzier. One ram its along the edge of the tail and on the other ram its in spots across the length of the tail (fuzzier not grainy like ich). One rummy looks like its little fin (on top, closest to the tail) looks completely fuzzy. They have just been added and are stressed from an ich treatment currently. The rams exhibited this a couple days after I got them and the rummy has had it since I added him.