I made the mistake of starting my crabitat with calcisand(I know shame on me) I didn't know any better yet. I changed to EE almost 2 weeks ago and now most of my 8 crabs dug down that day and have been under since!! none have molted since I've had them (almost 4 months) so any ideas?? Also having problems getting them to eat fresh natural food. Any suggestions on anything that might get their attention??