So you know, S barbatus run contrary to most Cory species. The males are bigger than the females. You should start to see some odontodes on the males at around 3 inches or so I think and the markings seem to get sharper as well.
Thats one of the many reasons I really wanted to get these. The sexual dimorphism that allows the males to develop their distinct almost gold flake markings on the head. I cant wait to see it!
I think i still have another year perhaps before they are mature. Shoot Rachel (mzjinkzd) a PM. She pm'd me not long ago about these fish and said that she may be getting some to sell in the near future.