I have a single bangaii in my tank. He is great. They do not move much, but their movements are so deliberate that they are actually cooler to watch then, say, a trigger, that just darts back and forth. A group is even neater b/c they'll move in sync together. He has been in my tank for 3 years. Very hardy. He has outlived a couple of tankmates. I agree, at least with this one, that they are picky. I have read that flake is not a good choice, but that is this one's favorite. I got him to take squid only b/c tankmates ate it. Mine's a little sketchy, as he'll flee from movement directly in front of the tank and it takes him a while to swim near new additions.