it was purple when I bought over the last couple months its been turning but over the past week it's gotten alot worse. But its only brown on the top the bottom of the rock and in the crevasse is purple.
It was treated, However. The charcoal got most of the treatment before it went to the tank. The inverts are happy and doing well, How do i get the reading back, what supps do I need to get, I felt it today its slimey.