Although excessive mucous/slime is common with PM it doesn't appear to be pinched mantle.
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I know this isn't a lighting issue.
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As Clams like Crocea/maxima grow they will depend more and more on photosynthesis so I wouldn't be so sure as you are that the lighting you have is sufficient. The overextension of the mantle and the fact that it's so light in color is a clear indication to me that it's not and if you new where these clams were collected you would understand.