Crocea clam closed up?

84chris

New member
My crocea clam which is regularly as wide open as possible, has closed up. Not all the way, but not nearly as it used to be. He is halfway under a 250 halide and a 400 on the sandbed. The last week it was leaning towards the 400, should i move him? Also tank parameters are in check, nothing out of the ordinary. I have had him for 3 months also. Thanks for any help.
 
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