Humidity is impacted by air flow a lot. Is the tub covered the same as it was before? For instance, if the tub had a snap on lid before that was not air tight but then you moved the tub to a tight fit rack enclosure where it makes the tub more air tight, that decrease in air flow will definitely increase the humidity. The way to lower humidity is add more air flow, you can do this by adding some small holes in the tub but only do a little at a time because if you add too much air flow it will become difficult to keep the humidity high enough. Good luck!
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