Hydroid?

kkgaskin90

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Is this a hydroid? I've read everything from "harmless" to "PANIC AND KILL IT WITH FIRE!!!"
They're in my QT
a8171a002e270c383fed777a238beef9.jpg
 
Here's a video (if it will upload in HD...) - you can see it pulsing in the water close to the top. So definitely a hydroid. There seems to be some debate over whether or not they are harmful. Thoughts?

 
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