Wire/stick-like algae with white on end

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Googling seems to be some form of hydroid, but I'm having difficulty identifying. These came off of @WWC frags. Perhaps they themselves know what's in their system?

They are definitely multiplying.

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Looks like hydroids. Are they soft to the touch? If so hydroids is my vote. If rigid, maybe little calcareous feather worms
 
In the fresh water shrimp world they are called hydras
And are a night mare to get ride of and are a pest that stings.
Imnew to SW so I’m not sure if I’m right.

Hydras are predatory and voracious. They eat worms, insect larvae, small crustaceans, larval fish, and other invertebrates, such as Daphnia and Cyclops. Hydra is not an active hunter. They are classic ambush predators that sit and wait for prey to come close enough to strike.
 

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