Possible Clam?????Weird???? ID Please

compinnov

Member
I purchased a bunch of Blue Mushrooms and I believe that I have an extra bonus. When I placed the Mushrooms into my tank and later when I was observing my tank I noticed that the bunch of Mushrooms actually look like they are growing onto of something that looks like a clam, mussel, or even an oyster??? Could some one please take a look at my pics and hopefully identify what this possible could be. The rock actually looks like a oyster shell instead of a rock. It only opens up about 1/4 of an inch and if there is any movement in the house and the disturbs the water then it slams shut. Any help with this would be greatly appreciated. John
 
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