Hydroids?

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LordJay

Aquarium Advice Apprentice
Joined
Mar 6, 2011
Messages
30
Been getting these lil critters on my tank glass. Its like 8 tentacles, a clear bubble and a white spot in top of it. My pics are, not kinda, but blurry so I researched a lil bit and the 4th pic is the closest I could get- pretty sure thats what it is.

What I really wanna know is why Im getting these? Does it means anything bout water conditions? Are they bad? Good? Insignificant? Filter feeders? ...do they hurt?

Any answers, I would really apreciate it.
 

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