While some of the more "durable" species will do OK with a constant temp I will have to go with John on this one. Actually I'll even go a step further and say it is simply a fact that all species will be healthier in general when given a temp range.
If you speak with anyone that has a large collection and changed at some point from a constant room temp to a temp gradiant, they will tell you that most of the unexplained problems that were happening here and there in their collection just seem to stop.
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Randy Whittington

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