Thanks! Wow 90%?! I couldn't imagine! & I do provide at least 4 hides per enclosure, two on hot side (one moist & one dry) & the same on the cool side. I haven't noticed any spikes or drops, I have noticed about a 5-8% more humidity. Where I live we have at least 50% humidity most of the time, so this was only intended to bring the humidity slightly up.
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It's been about 5-8% more humid. I'm sure it would really work better in a rub or rack system, glass just sucks to keep humidity in. I think I got the bowl from Petsmart... but what's the difference? Lol.