Keyhole Cichlid with Bump on Chin

I dunno, besides the interesting 'chin bump' your Keyhole actually looks to be in the peak of health. Even the protruding area shows no sign of being irritated or something. And, I'm guessing there is nothing pushing up inside it's mouth from the bump that causes problems with eating or anything, right?
Someone else may offer something about that bump. But for me, I'd say that Cichlid looks quite healthy and normal.

It seems to eat well, and has lots of personality. I've had it for four weeks in quarantine and just trying to decide if it's time to go into the main tank. I don't want to introduce anything bad... but if it's just some old scar or something, and the fish is otherwise healthy, then no point in keeping it separate.

Totally agree. Who knows how your Keyhole got that bump? Maybe an old battle wound from when it was much smaller? Or, it could possibly be something that it was just born with. Your Cichlid looks very good, and is swimming well in the video. And, if its as you say, and is eating normally? Well, four weeks is a good, long quarantine period.
I'd say it was time for that one to go back into circulation! :thumb: