Treat them like a CA geo. Offer them sand to sift and smallish foods. They do best in groups of five+. In smaller groups they can get a little picky on each other, but they're certainly no killers! A 125 gallon would be nice for a small group of these guys.
Add a bunch of dither fish to make them feel more comfortable too. They can be a little shy otherwise. They're not predatory, so you can use all kinds of reasonably sized fish as dithers. Livebearers, large tetras, bards, etc. would work. I wouldn't use aggressive cichlids (convicts, etc.) unless the tank is plenty large.