UV sterilizers kill organics that pass through them as long as they are moving slow enough to be killed, if you use a powerhead that forces the water through to fast for the critters to get a fatal exposure to UV light they won't all be killed.
As Brad says, it's not selective though, good as well as bad gets done in. If you have a hospital tank with a sick fish, UV is great, in a reef that's well maintained I wouldn't bother with one, again like Brad says, Skimmer .
Doug
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