They like groups but do fine on their own also. Anyhow, I am getting 2 more this week. My LFS doesn't carry many at a time, so I had to get the first one while I could and I will pick up more this week when the store gets them in. I will be picking up more embers too because they only had 3 but I plan to have a school of 6. The store doesn't like to order new things while there are a few left of any species in a tank. They want to sell them ALL before ordering more. But, my guy will be getting friends in a few days. In the meantime, he is chilling with my ABNP.