That is the clam. He is very responsive, attached firmly, but the hole is opening further. I had to move him some recently, and he is now under LED and used to be under t-5 and halide. Very close to water’s surface. Now it is in a 180 about 8 inch from surface under a Reefbreeders 48 photon V2 that is turned on pretty strong. 12 hour light cycle with about 4 of that being high intensity. Lights are 4-5 inches from waters surface but there is a cover glass over the tank. This the close placement. Seriotopra around him is growing and colored nice.