Aptasia or baby asterina starfish?

[BTimms]

I seem to have quite a few of these small creatures on my glass.

That said it is hard to tell if these are baby asterina stars or aptasia.

Any thoughts on an ID? Should I scrape them off the glass?

 

[shred5]

Hydroid.
Harmless kind.

 

[Hugh Mann]

+1 hydriod. I get them too.

Baby aiptasia just look like tiny, white aiptasia.

 

[BTimms]

Thank you! Much appreciated!

Hydroid.
Harmless kind.

+1 hydriod. I get them too.

Baby aiptasia just look like tiny, white aiptasia.

 

[BTimms]

Hydroid.
Harmless kind.

How do you know they are the harmless type?

 

[shred5]

How do you know they are the harmless type?

Experience. I have seen them many times. Medusa stage of jellyfish.
https://firsttimemarinekeeper.com/2019/06/04/critter-identification-hydroid-jellyfish/

 

[BTimms]

Experience. I have seen them many times. Medusa stage of jellyfish.
https://firsttimemarinekeeper.com/2019/06/04/critter-identification-hydroid-jellyfish/

Wonderful! Thank you for the further reading!