Going back to culling , i would like to point out that removing too large a proportion of the colony you wish to improve , gets your there faster , but you reach a point of no further progress for lack of genetic variability. I tend to cull the worst 20% of my colony once a month and observe a slow steady improvement. Hopefully my colony will continue to improve Long into the future. I have learnt about population genetics when i was interested in breeding fancy fowl, and kept up to date now that i am interested in shrimps and horses. The laws are the same.the greater the breeding population and the lower the percentage that is removed from reproducción, the healtier and more prolific will remain and the further the progress in recombining desirable caracters. A severe rate of culling makes your population very homogenous early on and improvement stops
I'm still new to the hobby but they kinda look like other post (could be wrong, but he called them glass shrimp) https://r.tapatalk.com/shareLink?url=https://skfaquatics.com/forum/topic/11301-what-kind-of-shrimp-are-these/&share_tid=11301&share_fid=50791&share_type=t
For the last pic it looks like a pinocchio shrimp (Caridina gracilirostris).
Maybe someone will correct me. Sorry couldn't help anymore.