Floating larvae?

[DebFerreira]

I have been noticing these little creatures occasionally when I blow the zoas off with turkey baster. The main body is whitish and about half the size of a grain of rice. While floating around they look similar to a single dandelion seed in flight. For reference the tank contains numerous zoas, and one each Duncan, torch, mushroom, pinwheel coral, and two blastomussa. CUC: various snails and micro brittle stars.

 

[bushdoc]

Most probably medusa stage of....Hydroids?
None of your other "corals" have medusa stage.
Do not take my word for granted though.