Guys........did you ever hear the sound of a pistol shrip before? Or when you go swimming or diving and you smack two rocks together. Thats what im hearing in my tank. Its not a pistol shrimp, could be, but i dont see any evidence like sand tracks and most come out when you feed. I might have young Mantis that hitch hiked. They are good at hiding. Its not my hermits or snails smacking on the glass either. My tank is not creeking or cracking, although i thaught it at first and was nervous but ruled it out. Its in the same location and its consitant day and night. Anyone know of anything else that makes that snapping sound?
