Since you said that it happened after moving it, it's likely that when you moved it, it collected air. Most people "burp" clams after moving them. Basically, tilt it every direction slowly to get any bubbles out of its body cavity.
If there are bubbles embedded in the mantle, that is a whole different story...this can be caused by a big change in light intensity Let me know if this is the case.
If there are bubbles embedded in the mantle, that is a whole different story...this can be caused by a big change in light intensity Let me know if this is the case.
