I just got him, and I'm worried about his condition. He seems to have a sort of ammonia burn on the top of his head, and just looks in poor condition in general. He's in a 65 litre filtered and heated tank, and I'm doing daily water changes (got him with the tank, I didn't know he came with it so I'm doing fish-in cycling unexpectedly). Is there anything else I should be doing to improve his health in the meantime, and should I be worried about the spot on his head?
https://www.reddit.com/gallery/1ktay0s
Posted by Sea_Individual7051