i had the same problem with mine besides the lice stacy.
ive had mine for 10 days, and they are both very active and eating blackworms, i was nervous at first too. the male is a little thin but ive been feeding 2 teaspoons of blackworms twice a days and hes coming around. he hardly ever buries himself in the sand anymore. unless im doing a water change but after he comes right back out. im goinig to stick with just blackworms for about a month then start to try earthworms and krill.
btw my male took a solid week to start eating.