What is this?

[D0ubt]

 

[DinoMagnet]

Looks like hydroids

 

[D0ubt]

Should I be concerned?

 

[F i s h y]

Should I be concerned?

Generally no, they typically disappear o their own.

 

[GHOSTLY]

Cool critter

 

[Alexopora]

Most reefers would identify this as medusa hydroids although am not quite sure what is its exact scientific name. These generally don’t cause much issues and they should disappear over the course of a a few days to a few weeks.