Hi
I purchased a bristlenose catfish yesterday.
He has been fine and behaving normally but has what appears to be a hole in his back that was not there yesterday.
He is in with 2 platys, 5 tetras, 3 male guppies and 2 ghost shrimp in a 170ltr tank. I don't have a home water testing kit as I usually take water samples to my local pet store.
He was behind the tank heater yesterday and I was wondering if is possible for him to have been burnt by it. Any advice or ideas will be greatly appreciated.