Nope it didn't move, I did notice it hiding a little bit more, so when it started to split it was like, "SURPRISE!". Bobby, AZNO3 is "Absolute Zero Nitrate", these drops that you add to the tank that are supposedly reef safe that will bring nitrates down to 0 within 30 days. Well, I dosed at less than what they recommended for a tank my size, it didn't hurt anything else in my tank, and my nitrates were 0 within two weeks, but unfortunately the BTA didn't make it... I had read that BTAs and clams seemed to be sensitive to the AZNO3 though beforehand, I still thought I'd give it a shot. My nitrates have stayed at 0 since then, I did change my feeding too (no more flakes, frozen only).