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What substrate did you use, I can only really see from the behaviour that that may be causing an/the issue, build up/release of too much fertilizers/minerals maybe. Probably worth doing another water change as its been a few days. Some substrates do have a run-in period as they can cause an ammonia spike or build up of minerals, though you ran it for 6 weeks so should have been ok I would have thought? The root tabs in the substrate may have made that worse as they will also be releasing minerals? Maybe do 2 water changes per week for now to dilute anything that may be accumulating in the water. Did you see any routine, ie none die day after water change but then start dying again etc? Have you seen any babies this week?

FWIW..I also lose a good 10% or more on shrimp thru the post. Dunno this will help....and seems you might have things turned around...but isn't 72 degrees a bit low? Would explain why the collect around the heater...they want it warmer. Also, generally I have found less is more with shrimp in terms of making changes. Seems like what you have done already was needed and is helping...but when you start to see some stability....just leave it be for a good while.

Still losing 1-2 Neos per day. Only Neos. Amanos are all holding steady. Everyone has a good food response. No signs of disease but I'm hardly an expert there. Whatever is going on is killing the Neos and leaving Amanos and Snails unaffected. One day they look good. The next they are dead. Always happens with them getting less active for a period then death. I want to say molt issue, but I see lots of successful molts. Are post molting issues a thing? Still confused. Still not doing anything as I don't have anything else do to really. As far as I can tell things are good in there. Temperature is the same as what they were being housed in at the dealer as per e-mails with them. They have also started to leave the heater so I'm figuring that is being used as a home base. A couple dozen can hide between the heater and the tank glass. It is a pretty safe spot.