the only way that i know to know for sure is to see the fish doing it. but if you have a fish type that is a known nipper and your clam is staying retracted or closed then that (the fish) is the first place i would look
Thanks! My crocea clam is opened nicely, has a good reaction to shade, looks altogether good. But i noticed two small yellowish spots on it. Is it possibly loosing it's color?
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