Shrimp are very easy to care for. Here's a few things you need to know about keeping them that I've learned.
Ph can be at any level fish can survive in, but some species prefer different levels.
Nitrate needs to be low. Shrimp are more sensitive to nitrate than fish. Try to keep it below 30ppm.
They can not be kept with fish that will eat them or bother them. Your fish are fine.
Shrimp will live from 2-3 years. They need a tank of at least 1g.
If you have ever used copper in the tank you can not keep shrimp unfortunately.
They can be sucked into the filter, so cover the intake.
Depending on the species, shrimp can and will reproduce in freshwater. The common species that will not are Amano, wood/bamboo, and ghost shrimp. Most fish and sometimes the shrimp themselves will eat the shrimp though.
A good shrimp to start with are Red cherry shrimp and Ghost shrimp. They are all easy, but some of the other varieties can be more sensitive.
You can find more info in planetinverts.com