Clam mantle receeding

[sstwelder]

Today i noticed that my clams mantle was receded. I got the clam last Sunday, it was looking great till today so i moved it up in the tank to have it closer to the light. Any help would be appreciated.

first pic is when we got it and second is right now.

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[sstwelder]

I should also mention that its outflow valve flinches it i block the light and just saw it poop

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[NYCBOB]

Any animal bothering it? Maxima clams need an established setup to thrive. U can try doing a freshwater dip if it doesn't get better.