I got my Bimac from fishsupply.com a few weeks ago. At first Pixel holed himself up. He was coming out, though, and eating clams. I saw the opened shells in one spot on the sand.
After about a day and a half to two days, I actually saw him out and eating, in his favorite "eating spot".
He started eating *a ton*. I got the 100 crabs from fishsupply.com, and he ate all of them in about a week and a half. I have started moving him over to hermit crabs (blue legged at first, and now the larger red legged).
He gets more and more active every day.
I would give him a couple more days. If you do not see evidence of him eating, though, you might start being worried.
Make sure you are checking all of your water parameters, in addition.
i got my bimac from fishsupply and everything was cool the first day. now all he does is hide in one hole and not come out. ive had him for three days, is he scared are is he stressed? he wont take any fresh food from me and i dont know if he's eat the baby clams i bought him. what do i do? 
