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It sounds like the tank is settling well so it would be best not to mess with it too much for now and ride itoutfor a few weeks. If there was some sort of problem then I would expect some of the shrimps to be weakened but die a bit later soyou wwould get some still die. Hopefully that is what has happened and the deaths will decline and once they breed the numbers will bounce back nicely. One other thing that you should bear in mind. Amano are much bigger than neocaridina and so not usually good tankmates as the Amanos will out compete the neocaridina in every aspect. The good thing with Amanos is they are easy to regulate the numbers as they don't breed in a normal aquarium setup. A few will usually be ok mixed together, and you have a large tank, but you may find you have too many Amanos (80 is a lot) competing with the neocaridina? You may need to try some shrimp food (baby) and bacter AE, the latter promotes biofilm growth rather than gets eaten! The fact that you haven't lost any Amanos and only neocaridina might indicate that that is part of the problem? Probably all you can do is give it another few weeks and see what happens and hopefully it will improve!

Landen aquasoil and sand. I'm fairly confident it did leach some ammonia at the start (combined with a lot of plant litter decay), but the ammonia, GH, KH, and TDS have been steady all week with no input from me. I'll do a small change sometime today or tomorrow because it is the scheduled time, but I'm really battling my desire to fiddle nonstop without a reason. The rest of the tank is doing very well. Algae is slowly dying back, probably from the snails and amanos. Plants are growing great. Only routine is 1-2 dead per 24 hours. Sometimes over night. Sometimes while I'm at work during the day. Also hard to gauge if less are dying because things are better or because there are less Neos to die... I'm well under half the initial population of 80 now. Happy thought right? I still see 3 (the same ones?) in a certain cluster of S.repens. Haven't noticed any new ones anywhere else.