I've had black lights in my house since I was 13 years old, and all sorts of pets, spiders, scorpions, squirrels, hedgehogs, and many others, and I've never had any ill effects on them as far as I could tell. Always had healthy animals. My snakes now have a black light (heat lamp) above their cage, although it is not of the florescent type, doesn't seem to bother them in the slightest.
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