Why should anyone care about Potassium? I’ll admit that it is a fringe chemical parameter that most hobbyists do not pay close attention to. I can say that several publications attribute blue coloration in corals to Potassium. If you have been in this hobby a while, you will know that blue is one of the most difficult colors to come across, especially if you are looking for blue coloration that also fluoresces.

MORE: Why you should be aware of Potassium in your reef tank