Hey there! So recently my parents got me a porcupine puffer for my birthday, and we have him in quarantine at the moment before he can go into our 215 gallon. However, I've noticed that he keeps 'pacing' the tank and is rubbing his lips on the walls which is ultimately hurting him (the scales in his lips have rubbed off). I'm trying to find things to keep his attention and keep him active but I'm finding it hard to find things that won't mess with the water quality (like getting him lots of inverts to hunt) or any fish safe toys. If anybody has any suggestions I would really appreciate the help.