I just recently purchased (about 4 days ago) a green brain coral. It appears to be acclimating ok. Today i noticed this brown discharge that was coming from one of the "mouths" of the brain. I watched it for a few minutes and it eventually completely came out and detached. It looked kind of long stringy and a dark brown color. What could this be?? Is it anything to worry about or is this something normal. This is the first brain that i have bought.