I'd say in a community. Vieja are not usually the best wet pets. They'd do fine in a 180, but when they're adults that tank might be too small. I have a 125, and it's just a growout tank.
Breeding would be great, but what do you do with all the babies? Unless you're planning on getting another tank to growout fish that hatch, I can't see breeding fish. That's kinda where I am right now--like to have a breeding pair, but don't want to get another tank any time soon.