I have two RTB's that are both about a year and a half old and I put two hides in each of their tubs. One at the cool end and one at the warm end, but neither one uses them at all. I have mine in an AP rack which is in a fairly dark room so I figure they feel pretty secure as is. Their whole enclosure is like one big cave for them. When they are young it's probably worthwhile to provide at least one hide, but generally once they are older they're not needed. My boas are far less secretive than my ball pythons were. Gotta love the feeding response too. My bp's were a royal PITA when it came to feeding, but the boas would eat every other day if I let them. They are like garbage disposals!