Homemade hide will it be ok
Re: Homemade hide will it be ok
I agree with Xotix. The cardboard interior could get wet and harbor bacteria, which you would never see, and the open ends don't offer much security. Find something that is more of a cave design - upside down bowl, planter dish, plastic chinese takeout container...
As far as putting one opening against the glass - it's GLASS, and could still look like an opening to a stressed BP.
Re: Homemade hide will it be ok
Is the cardboard too heavy-duty to cut and fold one end down, so it isn't open, and maybe hot glue it? Changing it weekly would definitely help with the icky-factor.