As I'm sure some of you already know. A puffer likes to 'lay down' and take a nap. My puffer doesn't like going to the bottom of the tank, I thought maybe it was due to the shells all over the bottom. So, I moved them into a pile off to the side to give him access to the substrate. Now he is trying to lay on the jagged pile of shells. I can tell this isn't comfy for him, as he keeps laying and getting right back up. So, I'm looking for some ideas on how I could 'make a bed' for him up higher in the tank. Something that would look nice, maybe hang off the top on the inside of the tank. Any ideas/advice?