Thanks! Yeah they love that thing. Its actually just a flat board. its cork bark. Not only do they climb on it, they also eat and pick at it. It has tannins which is another important part of their diet. I think the piece i have was about $20 off Amazon. I silicone'd it right to the tank glass, lol.

You can also get the cork bark in log form and i have seen where they love to hide and hang out inside of it. https://www.amazon.com/Zoo-Med-Natural-Round-Extra/dp/B001F9ANVG