Any idea what these are?

sailor4life

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Hey there I have a 35 dsa lagoon tank and in the recent weeks I’ve had these random things pop up not sure what they are. I asked other forums and no one knew any help would be appreciated thank you !
 

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ISpeakForTheSeas

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Welcome to Reef2Reef!

Videos can be pretty tricky to upload here - most people upload them to YouTube and link them here from there.

That said, those are colonial hydroids (the first video shows them pretty clearly once it zooms in) - I'm not sure which species (there are quite a few branching species like those), but (with a cursory glance) it reminded me Obelia spp.
 

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