Smaller water bowls, more ventilation in the tubs or a warmer room. One or a combination will be the answer to stopping condensation. We get condensation from ambient humidity and temp changes warm to cool. If the room is cool condensation will form on the cool side end. If there is too much RH in the tub and you have a proper gradient you will also get condensation. Ventilation will vent out unwanted RH and equilize temps, Smaller bowl drops RH warmer room increases the point where RH condenses.
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