new to clams question

Ryan009

New member
I have (2) new Crocea clams. One is about 3", the other is about 5". They are housed in a 210G tank under (3) 250W MH 10K with supplimental T5 atinic lighting.

I'm new to clams so I'm sure this is a stupid question, but the larger one has almost polyp like protrusions extending from the edge of the mantle. Is this normal?
 
Here's the photo guys. Normal or not?

IMG_3372_2.jpg
 
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