I've got 3 in a 20 gallon with a 10 inch or so platform covered with sand and slopping so that part of the 'beach' is in water, part is dry. They're doing quite well, thus far the aggression has been limited to dorsal flaring and chasing, usually over food or a favorite spot. They take bloodworms, small cubed krill or chopped large krill very well. I also feed them a brine shrimp/spirulina mix one or twice a week to keep their diet varied. Crickets weren't a huge hit, probably because it's hard to find any small enough for these guy when they're still young. Ghost shrimp go over better but I'm not sure they know what to do when they catch them, lol. Right now their tank mates are 1 molly, 2 red chromides, and a fiddler crab.
I attached a picture of the tank if you're interested.