i would not worry about the lump, because you can't do anything about it. it might be something as simple as a little deformity that he will live a long, healthy life with or it could be a tumor. who knows?
Well, it smoothed out a bit since I first posted this thread, its still visible though. I put him on guppies and platy's, he's been eating like 12 a day as opposed to his 2-3 comets, but it looks like its gone down.
I tried tilapia filets, and he is just not interested. He tried to eat my clown knifefish the other day, he is so battered.
I hope its just a small deformity and not something that can kill him. Like I said before he had a bunch of em, now he just has the one on his head.