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I think the main issue with glass aquariums and humidity has to do with the screen tops with a large surface area that you see for sale. so a plexiglass top would probably be fine as long as you have some ventilation.
years ago I worked part time for one of the big box pet stores in aquatics. at that time they had not gotten into the exotics such as herps and T's but it was still the same profit over everything deal. I was encouraged to give bad advice for a sale. of course I always tried to give accurate...