Jeez yeah shrimp are so sensitive, especially in such a small tank, and be careful when you do breakdowns, it can cause a cycle to spike if you disturb your bio media.
Just keep in mind you're still learning and I think everyone on this forum can agree we've gone through loss and moments where we slapped ourselves and thought "WHY would I do such a STUPID thing!?"
It sucks when you lose livestock because you immediately feel incompetent, but you have to have failures to learn.
My sister has a shrimp business locally and she's told me about entire shrimpments they got in that just freaked out after acclimation, dropping their berries and attempting to crawl out of the water. It was costly and painful, but you learn so much from it.
Don't be discouraged. It was only a couple of weeks ago when my gudgeons spawned one evening and I was silly enough to wait until the morning to remove the eggs, sure enough the morning revealed every last egg was in the belly of some ferocious snails.
On a different note, I've had a name change request that I'm sure everyone will be okay with--- change Florida Aquatic Gardeners to Aquatic Gardeners of Florida.