Trying to get a better picture... It might be dead goniopora, but I dont know why it would have just shown up. It is possible that I just over looked it, but I doubt it on that side... The tank is 1 week today, so I am sure whatever it is will probably die. Ammonia levels have dropped to 0, Nitrites are at 5 ppm, and Nitrates are still at 180 ppm... salt is at 1.024. Temp at 80 degrees. So it might not even matter..