I have found that the CRS do NOT do well in Chicago water. My have withered away slowly and I finally re-homed mine to someone with RO water. We're about to move and I plan on putting in an RO system in the house we're moving to and giving it another go. For the CRS, do people use pure RO or add a bit of hardness to the water? Or do the shrimp get their minerals from the food or supplements?