Acan releasing milky substance

[Bars]

So this is something I haven't seen before. I just happened to walk by the tank and all of a sudden I see my small 5 head frag releasing a white milky substance. All heads did at the same time and it immediately dissolved in the water column. They're retracted now.

Are they horny or something else?

 

[vetteguy53081]

May be zooxanthellae due to inadequate lighting or spawn
Pics or video under white lighting would help

 

[Bars]

This was the only picture I was able to take yesterday.

They looked fine again about an hour after and haven't seen them doing it since...