Could you try moving the tub a little more off the heating pad? I have a rack system and I have a major problem with condensation. I usually have to go in there once a day to wipe condensation off the tubs (they think its funny to tip over their water bowls. ) You could also use a smaller water dish.
See when i move them off the heating pad though, the cold side drops to around 76 or so and thats just way too cold. I am kindof at a loss right now, but i know its fairly common in tubs to have condensation.
Stephen.
6.5.15 Animals
1.2 Pomeranian's
0.1.15 Tropical Fish 2.2 Snakes:
0.1 2009 100% Het Piebald
0.1 Normal
1.0 Green Tree Python
1.0 Brazilian Rainbow Boa