Since you're new to shrimp, just start with Neos (Fire Reds). They're going to be easier for you.
But if you insist upon keeping both, you'll need to do a lot more research and reading here on the forum. There's tons of information about remineralization products specifically for CRS. Salty Shrimp, Shirakura, Mosura, et al.
For Crystals, you'll need a GH of probably 5, KH as close to 0 as possible. Those parameters aren't exactly ideal for Neos, which do better in harder water. (Neos will live and breed in those parameters, though).