in my experience with my 11ft male retic, i had him in an 8x3x2 and he did just fine, i have tried giving him a hide but he became more cage aggressive with it in there, he would go into a strike position when i opened his enclosure while he was in the hide and had a couple times where he struck as the door was opening. i took the hide back out and had no further problems after that. some may like hides but in my experience i dont have a hide in the enclosure when they reach a certain size. the cage he was in had good privacy with 2 small windows and no lights and i havent had any problems without a hide in there with him, and when i had my burms in the same kind of cages without hides, they had little to no aggression, my big female burm (12+ft)had never been aggressive in that enclosure. but i guess it really depends on the animal itself if they need a hide or not.