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Yes, I notice the shrimp in the 1st and 2nd pictures have more than just a stripe. I haven't seen cherries with such a mottled colouration. did this shrimp's colour revert back to normal after the moult?

Shrimp were doing fair for a while, but I have had a few die these last few weeks. The coloration is secondary, but would be nice to have a bit more homogenized. Good to know the stripe is normal, but many shrimp have more than just that as shown in the pictures. Been trying to lower the pH (without chemical adjusters) for a long time, but that's always a losing battle. Should I consider RO, or are there other methods of improving conditions? Not sure how else I could change all those otherwise. If it is a disease, should I explore options with medications the diseases forum lists as potential treatments?

Has the shrimp been dying consistently? Or are you just worried about the colouration? Your water parameters are a bit on the hard side and can do with lowering of ph, TDS, KH and GH. But if the shrimp are not dying then the colour is not something to be worried about. Many cherry reds have that stripe.

Apologies for the late reply, I had a lot of stuff that got in the way of basically everything. Parameters: 20 gallon moderately planted Filter: Fluval Aquaclear 50 No CO2, though I have the stuff for it. 12 Cherry shrimp 6 Otos 2 Assassin Snails Temp: 76° pH: ~8 Nitrates, nitrites, and ammonia: basically 0ppm Chlorine: Absolute 0ppm TDS: 295ppm KH: 8° GH: ~16-17° Waiting until copper test kit comes in to check that, but I do run my water a few minutes before using it. I do 25% water changes weekly. Link to shrimp images because they are too large to upload. Don't worry about the girl with the white ring, she molted perfectly and was fine. Having looked through the shrimp disease and diagnosis, I initially was thinking that they might have muscular necrosis, which is why I was looking into the medication. Taking another look at my parameters makes me second guess this. Might still be a disease, but I would be most grateful for any helpful advice/recommendations from those that know better. Thank you. I can move this to specifically Shrimp Disease and Diagnosis if that is more appropriate.

Have you looked on gumtree? Believe it or not they have a fish section that is usually full of hobbyists and breeders.