Haven't used mine since I discovered the joy of bricks. Boil 'em, use as decor, and give them a drowning at shed time. Long lasting humidity helper. Got my glass tank humidity levels and 55 to 60 consistently since I started using two-brick-flat rock hides. Get 75-80 for about four days (longer, depending on how close to the lamp they are) when I wet them for shed time. I just submerge them in a bowl of water, watch the bubbles, then take them out and set them on a paper towel for a couple minutes. When it stops creating a puddle and appears dry back in the tank it goes. Up goes humidity and Bob's yer uncle. I boil the bricks again roughly every other shed just for peace of mind.......after all they are basically stone sponges and could spawn crawlies. Works great, unless you just don't care for the look of brick in the tank. Haven't looked myself, but I suppose good ole walmart has fancier brick type stonework made for edging gardens and walkways and such.
Just a simple idea I figured I'd throw out there