That is not tape. I think what you might be seeing is residue from stickers that I had placed on the cage when I was little. When I was young I had a tree frog that I kept in this. Anyways they are on outside so no worries. I read the care sheet and saw the no tape part.Thanks for the help so far. Just ordered the thermostat. So in trying to keep him to a weekly feeding schedule is it ok to wait another week before trying to feed him again given that once next week arrives he won't have eaten in 3 weeks? Also should I just keep trying the f/t?