I got a pair of these at a local fish store. They are about 5". I currently have a new t5 fixture coming in so I will post pics when I install it. You can see the color in the altifrons better in this blurry pic.
G. Surinamensis (Terrible pics, doesn't do their color justice. They are now in a 75g bare bottom. Their sand got disgusting for some reason and I stripped the tank. Also debating on whether to keep then or not.)
They look like altifrons to me.. and I have those. but they are nice fish ... you just need some ditherfish to make them more confident. They can be timid and skittish.