I've never seen a convict close to that size, would be cool to see.
Here we only have multigenerational inbred stunted ones in a bottom tank in the back corner of the LFS. Anything bigger than 3 or 4 inches would be considered a monster.
I still like them though, wouldn't mind a pair in a small tank that's been set up nicely. They'd be cool for me and my kid would get a good biology lesson watching them breed and go about their business.

