have a read over the whole article that was linked.
Make sure it is indeed gapping...if it is, and If it keeps gapping, it's because it's unhappy.
Since you already have had a clam for a few years, I would rule out some kind of pest or pathogen.
Keep a close eye on it and see if it continues to gap, if it does, you will have to try to figure out why and make some changes.
it's most likely light related, as spectrum as well as intensity matter quite a bit to clams and it will either adjust, or you will have to help it out.
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