I keep 9 in a 10 gallon tank plus one whip scorpion. The depth of my substrate is about 8-9 inches. they all made tunnels under the substrateWell I am currently going to try and see how many I can communally keep in a 10 gal. Ill keep you guys updated. I think the number will be about 10. I have numerous hides everywhere. They were all just born.
I might move them all into a 20 gallon in the future