Flatworm - Harmful or No?

I've got these flatworms (at least I think they are flatworms) in my SPS tank. Any idea what they are?

 

Can't really tell on my phone. Maybe snail eggs? in fact, the culprit may be in the pic.

 

Do you have nerite snails in there?

 

Theres a nerite in the pic. Ya,they're nerite eggs.

 

Ding! Didn't see that one at first glance.

 

I have the same over my back glass. I agree that they are Nerite snails. Mine showed up a few weeks after my cuc showed up. They look identical.

 

Agreed. And even then if you had acro eating flat worms they are clear and are only seen after a dip when they are not on the coral itself. Red flatworms arent a big deal either in my experience. But you have neither.

 

Cool so I'll have some new baby nerites!

 

Sorry man,but they most likely won't hatch,most everything i've read on them says they need tidal water conditions,somewhat like brackish water, to hatch.

 

Nope, just the sacks.