What sort of hydroid is this?

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Cthulukelele

Cthulukelele

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These hydroids have been in my tank for years in small quantities. They grow on glass and rock and their tendrils are usually singular and can get several inches long. Any idea on what kind they are? They don't seem to annoy any of my coral.

1000037895.jpg
 
Tidal Gardens
looks like digitate hydroids
 

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