Can I just ask what you are intending to grow in your terrarium? My reasons for this are that some orchids prefer higher humidity than others. I would probably stay away from an automatic misting system if I was growing a lot of Paphs in a terrarium as you would probably find that with some additional base cover placed in the bottom of the terrarium, this would be sufficient for humidity of 50% - 60%.
If you are intending to stock your terrarium with orchids from higher altitudes then you would be wise to install automatic spray system especially if your collection is going to consist of mounted plants.
I cannot advise you as to the mistking system, but I have just ordered one of the Super Rain Mist Systems and will be installing it into one of my own growing cases as a trial. When it arrives and I have it running I will feed back.
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