FWIW, I've been using pure RO water in my frog collection for the last 10+ years. Ever since I started. I have some frogs that are probably around 8 years old that I raised from eggs. I have miniature orchids in those tanks and all tanks are heavily planted with small tropical plants and of course are heavily misted. Few of the benefits of using RO include....zero deposits when you overspray onto glass, zero chemicals from your tap water for your animals. Use tap water on glass for a month and you will be shocked how much crap ends up on it. RO cuts your maintenance by a huge factor.
Trust me when I tell you that I would not be recommending to use RO, if I didn't use it myself with great results. I don't operate on a premise of some hidden agenda and never would. I would not care if the misting system would work worse because you used tap water. If tap would be better, I'd recommend it. You'd just need to change tips more often. If you want - use tap water, but I just don't know why you would. Virtually every hobby uses RO water, aquaria, frogs, reptiles, birds, orchids, etc, etc...
interesting thing, few months ago I went to the homeopathic dr for a supplement regiment for myself (wife made me do it - don't trust the 'one a day'

, anyhow, the Dr. told me to avoid drinking tap water and if possible to invest in an RO filter....of course, I have a couple of those already and I've always been using them for myself with no ill effects.
anyhow, I'd consider dart frogs to be much more sensitive then chameleons and if they can last for 8 years of misting with RO several times per day and look healthy and breed for me regularly, I'd consider that good enough to recommend to others. .... I bet any money that if I used rain from my area the frog would already be dead. Rain drops pick up all kinds of crap on the way down, then any crap from the roof and gutters - no thanks - not for my darts

Anyhow, these posts about RO being bad or not bad pop up all the time on various forums....mainly because of urban legends that if you drink RO it will leach minerals from your body and you will die - very scary !!! ya, maybe if you drink 20 gal per day for 3 weeks and you don't eat anything, sure! ...gotta run, my 3 year old is interfering with my access to the keyboard
