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Old 12-15-2011, 10:47 AM   #1
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Hydroids on glass harmful?

I've got lots of these little star like things on my glass. I think they are called Hydroids. Are they harmful?
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Old 12-15-2011, 11:34 AM   #2
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Here is a good link to a HitchHiker FAQ.
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Old 12-15-2011, 12:07 PM   #3
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Pretty snowflake
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