Critter ID please.

[djm]

I have a lot of white specs appear on my glass. They are pure white and move very slowly if at all.
I managed to get a sample under the microscope. I have a few trochus snails in the tank which have been releasing eggs lately after a water change.
Can anyone help ID them from the pics attached?
Thanks in advance

 

[KMCA]

I got these too so I'll just wait for you to get answers... I mean bump!

 

[Reefer Reboot]

Ostracod