These are on my glass - do i keep or clean off

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Kristyreef

Kristyreef

Aquarium Advice Apprentice
Joined
Dec 5, 2013
Messages
12
Hi,

I've had these pop up on my glass.. They seem to be multiplying. Not sure what they are and if I need to keep or clean off?
 

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They are hydroids but not the super bad ones. They won't harm anything I promise :). I have a bunch in my tank too
 
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