i think plexi blocks uvb, which many plants use (but can live without) and many reptiles need for Vitamin D3 production. as i understand it, dart frogs don't actually require uvb. in the wild, many species don't get any uvb due to living under trees etc.
m1helmethead, if your tank has any openings, it would cause air exchange and cause the humidity to leave. simply put, to increase humidity, you need to block any screens. a towel wont work well, its not air or water proof.
as for the differences between acpart's and m1helmethead's humidity levels, thats easy. not everybody lives in exactly the same climate. some people live in dryer areas then others. living in a dryer area (like nevada) will result in it being harder to maintain humidity then for somebody living in a humid area (like florida)
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i wish i could put a small 309x94 pixel image here that is only 2.28kb :P
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