What are these?

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20210601_174639.jpg
can anyone tell me what these are please? They're all over my glass. About 2mm in size. Thank you
20210601_174709.jpg
 
Tidal Gardens
hydroids.
 
it looks like hydroids to me (tiny jellyfish). Its a common hitchhiker
 
Saltwater Aquarium
Thank you everyone. Are they harmless?
 
eh, i wouldn’t say harmless…
but they are part of a new tank maturing.
 
Top Shelf Aquatics

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