Hiya! The reason you want to use conditioned water is because though the chlorine will be gone the electrolytes that your frog will need will still be there. If I remember correctly, RO water will not have any of that (I could be wrong though I remember my friend telling me something about it being pure water with 0 ppm or something crazy like that).
Thought you would like an explanation as to why condition water is preferred.
Hope this made sense.
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