the cloth wont hurt it at all... and undertank heater will stick to the bottom of the tank... but you will need a temp gun, and a dimmer switch or thermostat. Honestly it's alot better for all terrestrial snakes. Now as for scale rot... that only happens from dirty conditions, which even if you spot clean your cage twice a day, you can miss some wet aspen which is usually right under where they're laying... I don't see anything there that looks like scale rot to me, but I can't see it as well as you can.