actually i started 3 out in a 1g and they were perfect, i only added more b/.c i switched them to a 10g. and they have more than plenty of room, some skim the top soime lay low in the bottom and swim around the decor and rocks. The only time they meet up and swim together and in unison, is when i do water changes, for about 30 minutes after the water change they group together along with the barbs. then they go off on their own again, chasing the females