New Derasa clam

[octasnow]

Hello I recently purchased a small derasa clam from my lfs and it has been in my tank for a little over a week. Ever since I put it in my tank ive noticed one end of the shells mantle dosent extend as far as the other end. Is this a normal occurrence or should I keep a closer eye on it? Besides that its very reactive to light and overall seems happy.

 

[Tahoe61]

Looks familiar.

The clam looks normal to me.
Is there any Aiptasia, Vermitid or algae on the shell?

 

[BriDroid]

I looks happy, like my derasa, and there is white shell growth. If there is anything bothering them, you can brush them with a toothbrush and that will knock off any algae, etc. They close up for a while but open right back up soon after.