10 gallons are fine, but once it gets larger it should be moved into a bigger cage. It isn't a good idea to house juvie cresteds together because one may dominate over the other if it is smaller. If you must keep them together make sure they are equal in size, but it isn't smart to house them together until you know what sex they are. Some say you can house them together,but why take the risk?
:Could you house a juvie in a 10 gal tank, and if s how long? Could you possibly put two in a 10 gal for a few moths? Thanks.