Hi, Ive took 2 sick tetras from a tank that isnt mine in order to help them. the tank is pretty neglected as water changes being made every4-6 weeks. both of the fish has some kind of external infection that look like patches and buldges on the skin and fins,one of them has his upper jaw looking very bad ,like the infection consume it and the other have severe fin rot on his tail.right nw i took them together to a clen 40 L tank with filteration,oxigen and 25C and i started treatment with sera baktopur. Ill add pictures later but from what ive described do you have idea what is this disease and whats the way to treat it? also do you have exp with this med? is it good? thnk you!