I think I did got the fish from an assorted tank. I'm not sure. It was over two years ago. He does have a pretty "big" mouth. He's a tad aggressive but not all the time. He does seem to "rule the tank" and go where ever he wants with not to many problems.
hi,i had a fish like that i pritty sure there called a firemouth they have a big mouth aggresive i had him in with my oscars had to take him out he kept attacking them.