Hey, I'm new here. Okay, I have a 15 gallon tank with 2 goldfish in (biggest one, about 5-6 inches long, is the one with the problem). It must've happened last night as I don't recall seeing it yesterday. But I noticed not long ago what looked like 2 white bumps with red on them, one on his top lip and on just above it. On closer inspection as he swam about, what I thought was a white bump was skin flapping about (only a little bit of skin) and it defintately looks like a cut and the blood looks quite fresh as in it probably didn't happen long ago. My question is, is there anything I should do? I did a partial water change, treated the water with TetraAqua EasyBalance and TertraAqua AquaSafe, and put some salt into the fresh water before adding it to the tank just in case, but that was before I realised it was a cut.