FINALLY! Been waiting for an update! LOL
this causes a lot of confusion, but over-feeding doesn't equate to pests in the aquarium. It might cause a population boom in said "pests" (seed shrimp, copepods, nematodes, snails, limpets, etc), but overfeeding in and of itself does not cause these pests to suddenly appear.
aka If they aren't there in the first place, then overfeeding doesn't result in these pests suddenly appearing. Far too many people word it incorrectly and this causes confusion.
I've heard mixed opinions about seed shrimp. Some people don't like them as they can compete with the shrimp over food. Some say that they may attack newly molted shrimp and kill them.
My personal experience is, oddly, at one. After a year of having a tank set up, and having *MULTIPLE* pests, seed shrimp, planaria and hydra were some of the few I didn't have... but a year later, I found ONE seed shrimp. Just one! Removed from aquarium and into a tiny container, kept water in it, and then life got a little crazy and well... it didn't get water... so no more seed shrimp!
Going the fishless route of attempting to get rid of them, you could always purchase or make a trap of some sort, bait it and then remove and clean each morning before putting it back into the tank.
Or maybe try some pygmy cories once the baby shrimp are larger? Hit or miss whether or not the cories will eat the shrimp, but best bet would be the pygmy cories since they're smaller... and the cories would dig around in the substrate looking for food.
can't wait to see the new shrimp!