Dats will probably look better in groups, but they are nippy with each other. The key is to get a group to spread the aggression. They are pretty slow growers. I got a group of 10 at 0.5" in January. And now the biggest is 4.5" and smallest at 3" At a small size, plenty of water changes and quality food will help them grow a little more rapidly. If you have just one and want more, I suggest buying another 3-5 at once. If you just buy another one, they will fight.