ray777;1060089; said:As for the question Nitrate are harmful if at a high amount. Stingrays cannot tolerate high Nitrates. In the long run it will cause them to have organ failure and shorten there life span. This is further detailed in the Stingray aqualog Book! I personally had a henlei die from it. This is also why a lot of rays die in shipping and shortly after shipping. They are left to long in the bags and the ammonia and Nitrate levels get so high.