What is this!

[shanedag]

Have had this guy for a while. Just moved him from a stock tank to a replacement aquarium. Never seen him come out in the light and extract whatever this is. Should I be concerned?

 

[MoshJosh]

Have had this guy for a while. Just moved him from a stock tank to a replacement aquarium. Never seen him come out in the light and extract whatever this is. Should I be concerned?

Super interesting, my guess is some type of spawning event.

 

[MoshJosh]

Have had this guy for a while. Just moved him from a stock tank to a replacement aquarium. Never seen him come out in the light and extract whatever this is. Should I be concerned?

Per Google:

"The males aggregate in piles of a dozen or more on top of coral heads for a synchronized release of red smoky sperm. At about the same time, individual female brittle stars climb to the tops of coral heads and stand on the very tips of their arms, releasing bright red eggs"

 

[ISpeakForTheSeas]

Yeah, that’s the spawning stance used by brittle/serpent stars and true starfish - cool to get on video!