i've had my tank 4 years and this is my first encounter with ich. i think i introduced it lastweek when i bought 2 fish from Walmart...i knew at the time i shouldn't but i felt bad for the fish so had to save a couple of them..i'm sure most of you have heard or seen for yourself that some (maybe not all) Walmart's should either stop carrying fish or enforce better quality control. I was so disgusted, i'd never seen anything like it, the tanks were filthy, multiple dead fish in every tank. i stood there for 20 minutes fuming, waiting for a sales associate to vent on, but no one came. Finally, it just so happened that a group of what appeared to be vips were doing a walk through of the store...i saw my opportunity and went for it. I approached them with my disgust over the fish tanks, 3 of them came over and apologized and the manager got an associate to take care of the situation immediately. One of the vips was also disgusted, as he has fish at home and even he expressed that they should stop carrying fish ... Anyway even after this i decided to buy 2 oscars, it was the least i could do for the poor fish. now my tank is infested with what i believe to be ich, all the symptoms are there. i have 2 oscars, 2 angels, i think a chinese algae eater, and 2 different types of catfish...i think one is commonly known as an upside down catfish? and the other i have no idea...not even sure if it's a catfish but think so. it's black with spots and alot of spiny things? i've had it along time and can't remember what it is...i want to try the aquarium salt and raise the temp treatment, somewhere i read that salt and warmer water will cure almost all freshwater fish diseases, but i've read that not all fish can withstand salt in the water. so does anyone know if my fish can tolerate it? thanks