That does not appear to be a maxima. It is probably either a corcea or a dersa. It is impossible to tell which of the two it is from the picture. Stop moving it, and please don't shade a clam, in the wild they are some of the most shallow water things we keep in the hobby and they get 99% of what they need from light. And then before moving it again do some solid research on ALL types of clams, not just youtube videos, but many many articles. Changing your water parameters and lighting all over the place will not help. Just going to stress the rest of your tank.