Maybe geophagus iporangensis?
HUKIT said:Good ID!
I knew it didn't look like a satanoperca sp., but had to be an earth eater, so I googled geophagus and scrolled through images till I found an individual picture that looked similar, then cross checked the species in that picture to another google search. Playing detective over here I'd be so proud of myself if I pulled that outta straight knowledge, but I can't take ALL the credit for that