Hi, I just recently bought a 6 inch baby fire eel from Wal-Mart (I was told already that Wal-Mart is the worst place for fish) 3 days ago and was doing fine, until this morning I noticed at first, it was trying to bite its tail, and then a couple hours later it stopped moving around and lying upside down on the floor, or hanging over objects, breathing slowly. The underside of the belly is coming whitish-grayish, it has some spots. At first, I thought it was ick, but I think ick goes all over the fish so maybe columnaris? I'm not too sure, but I took him out of the tank and stuck him in a hospital tank. I added some aquarium salt and maracyn to the water. As of the moment, he breathes a little better but still lies still in awkward positions and when he does move it looks disoriented, and also he twitches. I never got to see him eat before, but I always stuck live tubifex worms where he would hide at and then turn off the lights. My tank size at the moment is 20 gallons, I'm going to be upgrading it in a couple of months, and is freshwater. I just set up this tank 2 weeks ago and got fish that are still babies (not at Wal-Mart, but a tropical fish store). They are an albino Rainbow Shark
, a dragon bichir, black ghost knife, plecostomus, mystery snail, and two african dwarf frogs cause I thought they were pretty cool. I have only artificial plants in the tank at the moment cause I heard about them uprooting a lot of live plants. Right now, the water parameters are a temperature of 78 degrees, ammonia, nitrite and nitrate levels are 0, but the pH is 7.6, so I am going to try lower the pH. I just performed a 50% water change right before I introduced the fire eel into the tank. All my other fish are doing fine and I just bought the fire eel and I don't want to lose it ..... I'm hoping I'm doing the right things and diagnosed him correctly, but any help will be appreciated.