Seed shrimp have a protective clam-like shell thicker than "real" shrimp because it is an Ostracod, not a true shrimp. It's reaction to being investigated by a fish is to act like a rock, and many fish will pass them by. They don't often show up in tanks and reproduce. They are likely to disappear after a time but by then your shrimp may be gone too. I would rescue the shrimp to a new setup, taking pains not to transfer any seed shrimp, then do what you will with them, feed them to something, put anabantoids in the tank which tend to eat these guys if little other food is available. When I raised bettas, I found that a few seed shrimp (also called hard shelled daphnia, which they are not related to either) in each jar would keep the jar clean and the water clear. The bettas would not eat them until I left for a weekend. When I came back all the seed shrimp were gone and I had to put new ones in from the culture tank.
