Leiurus quinquestriatus cage

So I'm planning on getting a few LQs soon. I have been working on the cage I'm going to keep them in. Its a 20 gallon long tank with play sand and a few caves. I currently have 6 C. sculpturatus, 5 C. vittatus, 4 P. imperator, 1 H. trilineatus, and 6 V. spinigerus. Here is the LQ cage so far the sand is still a little wet.

nice cage !! but ur sand seems wet .... LQ are desert sp

I wet the sand so it would harden when it drys. the sand is hard where it is dry at.

Are they communal?

From what I have read they are communal as adults but not when they are young. I'm planing on getting 5 for the tank. I have heard of people putting up to 8 in a 10 gallon tank.