Guianacara are neat fish ... think like a cross between Gymnogeophagus and keyholes. Most common species is Guianacara sphenozona, the one usually sold as geayi. It's rare to find real geayi, like the real Geophagus surinamensis they are only found in French Surinam, an area that's not commically collected. These guys are acaras that think they are geophagus, I'd kept them just like Gymno's but of course in warmer, consistant water. Those ones you saw were probably full grown, largest males I've seen were 6" or so. Had them way back (circa 1994 or so). More touchy than other acaras, but no so bad as Satanoperca or gymno's though. Dutch Dude has some Rio Caroni species I believe, so if he isn't too busy I'm sure he will pipe up. I remember someone else here on the forum has bred them, but can't remember whom. I kept mine like keyholes, they did well but never spawned for me. Didn't have them long though, traded them back to the LFS I worked at.
