Decor questions

I recently acquired a 100 gallon tank for Fred my bearded dragon and after transferring all his decor the tank is extremely bare. I'm wanting to know if I can add live plants like cacti and othe dessert fauna to his terrarium also, wanting to add some rocks anything I should be concerned about?

I would ask on a Beardie forum :) Here you arnt likely to get many awnsers. My closest experience with them was yesterday,talking to someone who has baby's for sale :)