I dipped it in 1.026 saltwater just to clean anything loose off and put it in the tank. I had one big limpet, a few snails, sponges, caulerpa, tunicates, gracilleria, some kind of muscles that are still alive, hidden cup coral, some kind of coral that looks like galaxea, and an anemone that is similar to aiptasia but is definitely different. The only bad thing I've noticed is a small crab which I believe is a gorilla crab but I'm not positive. It's small so I'm not too worried about it yet. I debated for a while and finally decided to order and for 8 pounds of rock I was surprised how much life was on it. I would definitely buy from them again.