Thanks, Judd. I had him in a small/tall exo then moved him to a tub. I didn't really like the tub setup so I put him in the larger 18x18x18 and I think it's a good size for him. I like to be able to see him and could not do that in a tub, plus he's in my living room so the exo looks better. You should post a pick of your Amazon in the thread...hint hint.....