I never told you that I was running carbon. The leather that is in the tank right now isn't even the leather we got from you. This leather we got from Mel and have had it for right about 3 months, when we combined it with your leathers in the tank the toxins were too much for the tank so we took them out and placed them in their own tank. I have the book here at the house to show you where it says that the species of brain that we had was more sensitive to the toxins than most other brains. My other inhabitants in my tank are thriving, including the bubble coral, the torch, the zoas, the leather, the motipora caps, the mystery sps, the zenia. Not wanting to argue here just telling you what my wife and I have both read in the past 2 days, and it makes sense as to why the brain died.