This fella was out and about for the first week or so after i bought him but for the most part of the last 3 or 4 years he hangs out under that piece of wood in a crack so he's usually completely hidden. I know he comes out at night and feeds off the glass because I've seen him do it a few times which is great since I wanted him to do that. I rarely clean the glass. One Otto can't do the job alone.