Personally, I would stay clear of distilled water in the long term. When tap water is properly dechlored, it is actually much better for their soaking because it still contains trace elements that they absorb through the skin and are beneficial. Distilled and purified water has had all of that removed and can actually be a detriment to frogs that like to soak as it deprives them of the naturally occurring minerals. Either leave it out and open for a couple days or treat with Prime.
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I will keep this in mind when I move them to their 40 gallon.
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