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Josh, I use Salty Shrimp 8.5. Although it's harder to dissolve, I've been successful by first mixing the remineralizer with 1 quart of carbonated water and allowing it to set for 24 hours, stirring occasionally. Then adding RODI water to fill a five gallon bucket. Add CO2 for 48 hours while heated and covered. If you are raising ONLY Cardinal Sulawesi you can use the Salty Shrimp 7.5.

So update. I got frustrated when a few more days of 1-2 deaths happened. I turned the CO2 back on for 3 hours in the morning. I started doing 25% water changes every other day to combat the staghorn algae that had arrived from the combination of lowered plant growth and increased shrimp feedings. I started dosing Flourish Excel at 1/2 suggested rate. I added 50 ember tetras and 20 pygmy cory cats. I added more plants. I installed a second canister filter because I did not like the low flow on one side of the tank. And more stuff I had been holding off on because of the seemingly frail shrimp. I now have several egg laden females, ~10 sighted babies, and a seemingly growing neocaridina population. Maybe all the weak ones died from some mysterious disease? Guess it's possible. Ultimately, I'm moving on with the actual problem being a mystery.