Althought shrimp breed readily, there are many species that have very specific requirements...CRS being one of them. Before you invest your money, you should hve a good idea of what your hardness and pH are. Although alot of crays are less discerning about those parameters, CRS will not do well in hard water at all and are pretty particular about water temperature. They like cooler waters, a neutral to soft pH and low low hardness. I would not recommend them at all for a beginner invertebrate keeper unless your source water matches these aforementioned parameters.