There is also the Uaru Sp. 'Orange' variety, which may or may not be a regional variant of U. amphiacanthoides.
As for keeping them, a big tank with warm soft-ish water, plenty of food with high vege content, some driftwood (a must as they nibble at it), and reasonably robust but not too aggressive tankmates and they'll thrive for you. Best bet is to start with a group of 5-6 youngsters, and you can thin them down to a pair as they grow (or keep the lot if you have a large enough tank). They're really neat fish, one of my favourites!