Identify the fish game

Scleromystax lacerdai
 
I was going to guess that, but all the Scleromystax sp. have a decidedly forked tail. The fish in the picture pretty clearly has a rounded tail fin so I don't think its one of those.
 
Callichthys callichthys? There aren't too many fish in family Callichthyidae with noon-forked tails, and I'm fairly certain its some sort of armored catfish.
 
Hoplosternum punctatum
 
Hoplosternum thoracatum!!!!!!!!!...sorry didn't see your "hint"
 
AquariaCentral.com