very nice my uncle has a breeding pair, hes had them for 8 years. i have tried buying them from him, but no sale. everywhere i have seen them their really expensive, like $30+.
sexiascatus and tretocephalus do look alot alike especially when younger. as they get older you'll be able to tell the difference more. you should be able to find one at almost any decent aquarium shop. if they don't have them just ask. many times they will order them for you.
they're not as bad a a sexfasciatus. i have mine in with a peacock, frontosa, 2 daffodils, 2 calvus, a julidochromis dickfeldi and a furcifer. there realy is no way to sex them.
I don't think it's a Ven or a stoni, it looks to me, like a female fusco, b