Mushroom reproducing or spawning?

[OliverH]

I really dont know what it is.

 

[cdemoss01]

I really dont know what it is.

Confusing... #reefsquad no idea what that is make sure to watch it just in case its a pest.

 

[Timfish]

Looks like mesenterial threads. All corals have them and they are used for digestion and defense. My guess is something irritated it.

https://cdhc.noaa.gov/coral-biology/coral-biology/

 

[OliverH]

Looks like mesenterial threads. All corals have them and they are used for digestion and defense. My guess is something irritated it.

https://cdhc.noaa.gov/coral-biology/coral-biology/

Might be