The bp you purchased from Petsmart came with a receipt and a period of time to meet with your satisfaction or not. If you purchased one from them in the past and it died why even purchase another animal from that particular store? Maybe next time try a reputable breeder? I understand the rescue part but why start with a problem when you really don't have to? On another note you can solve the humidity issue by purchasing a "versa top" for your enclosure from Petsmart or Petland. It is a folding glass top that fits the exact measurements of the sized tank you have. Comes with a plastic attachment that slides onto the glass and you can put air holes into that part to facilitate oxygen exchange. Good luck. Stay in peace and not pieces. A.C.