Clam ?

Ba19Ma88

Non-member
I have two clams in my tank, they have been in the tank for over a year. On looks normal and the other is over inflated it looks like it is almost coming out of its shell.

It does not look normal and if you put your hand so it blocks the light it de-flates like the other one does.

Is this a sign of hunger or ??
Should I be concerned?
 
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