I have a 24g tank and I have had a crab in my tank since I bought one piece of LR. I have tried the glass burried in the sand trick and I have also tried the water bottle trick, where you cut the top of the bottle off and flip it around and place it inside the bottle. As of yet still no luck. After seeing him again tonight he has gotten pretty big. His body is definitely the size of a U.S. dollar coin. Anyone have any ideas on how to get this guy out of my tank ? I am pretty sure he took out my other clown fish :/. Right now I have nothing in my tank but the rock about 19 snails and my single clown fish.