Yea I agree I had originally bought 3 Dats, but 1 died due to parasites, and even then when I had 3 one would boss the other two around, so I'm going to have to buy at least 3 more to separate the aggression
Get a bunch, there should be minimal fighting as long is there a hiding spot for each dat...Mine love anything they can swim into and hideout. They come right out when they smell bloodworms..