Mystery veligers

I found these in with the pipefish fry I snagged last night.  Don't know exactly what they are, but they appear to be some sort of snail or bivalve veligers.  They are perhaps 400 or 500 microns in size.  I observed them up against the glass of the 2 gallon fishbowls the pipe fry are in.  They have this funny, up and down motion, with a period of appx. 3 seconds per cycle.
 

 

 

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They have wings! Red Bull spawn?

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What is your process to catch these guys Jim? Reef tank? What do you leave on / turn off?

-Adam

Veligers for sure,Jim
You should be able to see if the shell is that of a snail or a bibalve.
Feed them some phyto and watc them grow and settle

@Adam:  My 210 display is really more of a FOWLR tank.  The Bluestripe pipefish broodstock live in there, and every 4 nights, I turn off all pumps and all lights in the room, and use a Chad Vossen larval snagger to catch the pipefish fry.  Some nights, I catch some unintended volunteers.  These were inadvertently caught last night.
 
@Luis:  I looked at some under the scope, and to me, they look more like snails than bivalves right now.  More of a cup-shaped shell with a slight spiral turn, and not a hinged structure, at least at this stage.

Snails they are,then!
What spp you keep there?.Have you seen eggs on the tank walls?

Looks like snail or nudibranch veligers to me.

--Andy, the bucket man.
"Not to know the mandolin is to argue oneself unknown...." --Clara Lanza, 1886