That guy with the massive hump looks like some kind of hybrid. Like a different fish masquerading as an orangehead. He's really cool. What kind of temperament does he have?
I am so jealous of you guys' orangeheads colors. Mine, as Ed has seen on another site, are much duller in color. My juvies, which I have been powerfeeding, are closing in on 3" and have great color, it's just the adults having issues with the coloration. It's driving me crazy.
Anyway, they're a great new addition, Scubarod. And at a steal of a price. They're great fish to keep. If I were you though I wouldn't keep them with datnoids, but with other south american fish. Maybe other eartheaters or just some tetras. I'd also switch to a lighter substrate and rounder rocks like Ed's tank, but that's just me. These guys are interesting and colorful enough to be the focus of the tank so there's no need to go too overboard on tankmates. I keep dats too, but they're the focus of another tank, not the one with the geos.