Hello, this guy came with a tank I recently purchased. He was in with a bunch of African cichlids. I'm guessing he's some sort of synindotis. He's about 7" long. Thanks.
Yours is an adult. PCF Cat-eLog entry I linked first does not have a pic of such a mature fish but I'd say that it looks to be that hybrid in the first link. I struggle to match this with any genuine syno species.