Sump creatures

[Fish Dad]

What are these?

My sump is going great with lots pod and feather dusters and snails seem to get more every week.

This is something just notice - swims rather then crawl like a pod, really quick.
Finally got a picture of a bigger one, I got two in the pic can get idea on size compare to Caulerpa grape in back ground. These guys are fast and don't really look like Brine shrimp but do look Shrimpy.

Also noticed when I blew up the pictures, got tons of little snail looking things all over my glass?
Have to see what they turn in to also.

[MizTanks]

Lil bitty Shrimp!!