Crystal Black S Grade. The above pic is of the actual shrimp that you will receive if ordered. Water Parameters are very important with any crystal shrimp. Ph 6.5 Gh 4-6 Kh 0-1 Tds 120-150 Temperature 22 Celsius Co2 is not recommended as they prefer oxygen rich water. Crystals are extremely sensitive to chemicals. To achieve these water parameters please use RO water and salty shrimp bee gh+ salt or the Sl Aqua Liquid Bee Salt. A clip on fan and an aquarium soil is also recommended .