Scolymia- possible issue

[Andrei P]

Hello everyone, I've had this scoly for more than two years, but lately I've noticed something strange. During the night it looks like in the attached picture. What do you think it could be?

 

[reefsaver]

I'm a total noob and it's probably inanely rare. But maybe it's sperm?

 

[VintageReefer]

Hello everyone, I've had this scoly for more than two years, but lately I've noticed something strange. During the night it looks like in the attached picture. What do you think it could be?

I know exactly what it is. I have a scoly around 6 months that’s doing the same thing. First few months were fine then these started appearing and now are there almost always

Mesenterial Filaments are the inside guts of a coral that some species can expel onto nearby adversaries. Mesenterial filaments contain nematocysts as well as digestive enzymes and can do significant harm by coating the target for hours.



I read they go away on their own, but not for me. They are more present at night but remain in the day. Assuming it was territorial and coral warfare related I have tried moving the scoly to several places, and isolating it. Did not help. Other scoly are fine in my tank so I do not know the cause