Acro help. Are these white strings a feeding response?

[Hemmbone20]

Frag on the left is a strawberry shortcake, and the one on the right is a wwc suicide squad.. they’ve been in my tank about 2 weeks.
I’ve been noticing these white strings from time to time but otherwise the frags look healthy and acclimating well.

Any idea what this is?

I’m new to keeping acros..

 

[Hemmbone20]

Parameters before anybody asks..
Alk: 8
Calc: 430
Mag: 1350
P04: 0.1
No3: 15ppm
Sal: 35pt
Temp: 78

 

[Hemmbone20]

 

[Tahoe61]

Mesenterial filaments, a feeding response and a defense mechanism when needed.

 

[Rach77]

Just from the video almost appears to be vermetid snails feeding. Could be wrong. That's my vote

 

[Rach77]

Mesenterial filaments, a feeding response and a defense mechanism when needed.

Like when you rub an aiptasia??

 

[Hemmbone20]

Just from the video almost appears to be vermetid snails feeding. Could be wrong. That's my vote

Definitely not that. There’s no vermetid snails on those plugs… I know all too well what those look like!

 

[Hemmbone20]

Mesenterial filaments, a feeding response and a defense mechanism when needed.

Thank you. I fed the tank mysis about 15 before these showed up. I assume it’s a sign of good health then, that’s good.

 

[Tahoe61]

Like when you rub an aiptasia??

Mesenterial filaments are internal structures of corals. They are used by Lps and Sps to sting other encroaching corals. You see them as a feeding response in both stoney corals types. Coralmorphs will display them when stressed or splitting.