Unknown creatures/egg cases on glass of brackish opal ula tank

[towerkzar]

These are microscopic views of something populating the glass and some artificial plants in a 5 gallon brackish tank I’m preparing. There are no shrimp yet, but I do have Nerite and Nassarius Vibex snails which are very active. In the last 4 days these micro specks have appeared. They are approximately 1/4 mm in size, only visible in my digital microscope at high magnification. They do not move at all which leads me to believe they are very tiny egg cases of some kind. An online image search has not been helpful in identifying these. I hope someone here will know what we are looking at.
Thanks.

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[LoachNLoaded]

It’s the Nerite my friend. You’ll see them everywhere and they’re hard to scrape off.

 

[towerkzar]

Those cases are not much bigger than a grain of salt, apparently Nerites start really small! There aren't as many on the glass these days, but I do see tiny while specks attached to the plastic plants now.