It started off as redness on the skin and I thought it was his usual rubbing against the filter pipe. Is this just a wound that will heal over time or is it something serious that needs a special medication ?
I don't know anything about fishes and this giant gourami was my late father's. All I do is feed him and clean out the filter once in a while. I don't have water testers or any of that sort so I don't really have that information on me.
Thanks a lot for reading and I hope someone might be able to put my mind at ease.