Clam on LR

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I am real new at this but needed to ask a question. I have been buying FL LR from LFS and it has all kinds of neat stuff on it including some clams(I don't know what type)They look a little like Brazil nuts. Anyway, I can see them opening and closing at times. One fell or disattached itself and is now on the sand next to the LR. Should I leave it there? Do you feed clams? Any help would be appreciated.

 

[tjkohler]

I'm pretty sure those type of clams are strickly filter feeders so you shouldn't have to do much. I would grab it from the sand bed though and place it on the rock where it would have decent water movement. Might have to 'glue' it there. I've got 3-4 of them on my rock ... all dead by the time I bought it though.