Got these funny little white things swimming around in my tank (planted, 2 cherry, 1 sakura and 1 blue, some pond snails). Really really small at the moment, dart here and there really quickly. Too small to take a picture of.
None of the shrimp have 'berried' yet, as far as I'm aware. We lost 3, last one died a couple of weeks ago.
Pic of eggs which I'm pretty sure they hatched from:
Certainly not snails (unless snails swim and dart around to begin with!).