my clam

[the marine apprentice]

ok im not exactly sure if this is the right place to post this but here goes.
i moved all my stuff from my 30g bowfront on wed, all my rock my coral my fish etc. and included with that was my 5 inch purple clam who opened right up in the 90 about 5mins after he got in. he was open all day yesterday and i woke up this morning and he is all closed up like he is scared or something. im not sure is there maybe a fish nippin at it or something?
the fish i have in there are a koran angel, regal tang, sixline wrasse, blue damsel, yellow damsel, engineer goby, clown goby, a big percula, a smaller saddleback clown, and three lyre tail chromis. so if anyone has any ideas about why my clam would be closed up that'd be great.
tks
terry