Yes, it is. Thing is though not all dragons are compatible with one another, and may fight to no end. I keep 3 females in a 5x2x2 tank, and have done so for a few years. Initially they would go at one another but they calmed down and have acclimated over time. There seems to be enough space for all of them to get by, but more would be better.

Males should be kept alone or with groups of females, but two or more males in the same tank is a recipe for disaster.