Flatworm? ID from vendor coral from Saturday's meeting

[Kathryn Lawson]

I found these flatworms? on a vendor's coral (montipora) that I picked up from the meeting on Saturday. Anyone know what they might be? I found them while cleaning the frags before dipping, so they haven't been introduced to anything but the other corals I got from that vendor. They don't look like the "normal" red planaria I've seen in the past, and the monti frags do look like they might have been damaged by some sort of pest. Wondering how concerned I should be, what treatments I should use on the exposed corals, etc.

 

Bonus question - also found the egg sacs also shown in the pics. The sacs are 3D and turgid (kinda like a disc-shaped bubble algae), and the inside dots are loose and seem to "rattle" around when the sac is moved. Any thoughts on what they might be? I'm thinking maybe some sort of snail, since they remind me of the egg sacs I've seen from freshwater snails and dove snails, except that those are flat/one-sided and attached to a surface, whereas these could be pulled off the surface they were on and kept their flattened-bubble shape

 

[miggs76]

Those sure look like AEFW but strange that they would be on a monti

 

https://melevsreef.com/articles/acropora-eating-flat-worms-aefw

Edited May 19 by miggs76

[DaJMasta]

Flattened bubble shaped egg sacs could be columbellid or collonista snails - if you can get some magnification on it, it may be easier to find out.

 

Not sure about the flatworm, looks on the larger and more textured side to me compared to those AEFW shots, but I'm sure there are more than one variety and if it's a flatworm coming in on coral, there's a good chance it's a pest.