If you really want to. First I would keep their cages very close by and then try introducing them on neutral ground if they get along then try in their regular playplace and if maybe after 3-4 weeks of good behaviour you could try moving them into the 30 gallon and just keep constant watch for awhile.

Also for the cage if you do get this far then make sure you have atleast two wheels, 3-4 beds/hidey places, a large enough food dish for both of them to sit in it and eat together, maybe 2 water bottles. Basically so they will not fight over stuff.

Good Luck!