I'm setting up a 90 gallon rain forest vivarium. I've ordered a Mist king system. But I really don't know how often or how long I should run it. How do other people do it?
It depends on the needs of your animals and plants. The geckos I have that need misting (crested geckos, gargoyles, a leachianus and a few day gecko species) need it humid but not soaking. I mist the nocturnal geckos in the evenings and the day geckos in the mornings. For these species I mist once a day. Once you know how much moisture your plants and animals need you can figure it out (and Mist King may be able to provide some suggestions if necessary).