My understanding is that evaporation lowers the tank temperature. I would remove the coverings and see if the temperature drops as a result. On that note, however, my tank fairly regularly hits 85F, and I know there are others here who have seen 90F.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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