I'm really new to all of this but hope to gain more knowledge of fish care as I have two goldfish that I have adopted from a friend.
I have a 35 litre tank although I feel this may be a bit small for two at 2 1/2 inches long.
I am having a bit of a problem tho one of my fish has just recently got a wound on its side which appears to by bulging with a with substance I am extremely confused as to what this is and how it has happened. Does anyone have an idea what it could be?
I do a water change every two weeks (is this frequent enough?) and they appear to have been fine up to now.
I am a complete novice when it comes to my fish but I do worry I'm doing the wrong thing if anyone has any ideas I'd really appreciate it x
Ive attached some pics