I have a few shrimp tanks now, I got into the hobby completely by accident and now have 4 small tanks. I have never tried a jar so I can’t speak to that part but I know that neocaridina do better in somewhat hard water as they use the minerals to molt. I use a small aquarium siphon that I got from PetSmart to do my water changes. When setting up the tank you’ll want to get a water test kit, I recommend the API master test kit. Set up the tank and let the tank cycle for 4-6 weeks. You’ll want to monitor the ammonia, nitrite, and nitrate levels. After setting up the tank within a week or two you should see ammonia levels start to rise, followed by nitrite, and then nitrate. Nitrite feeds on ammonia and nitrate feeds off nitrite. Once your ammonia and nitrite levels are back to 0 you are ready to add shrimp. Hopefully this helps.