My cichlid fish got huge all the sudden. Two days ago he wasn't that big and he was full grown I thought. He also started changing colors on his fins and looks way different. I just recently added three new fish same kind as well. I'm just wondering why he is so much bigger after I added the fish in. Has anyone ever seen this or heard of this? He's not sick either. Could be a boy or a girl not sure though.

Sadly, it sounds like Malawi Bloat. Do a Google search for it for more information.