Well, I didn't know anything about fiddler crabs since I've never had one as a pet, but since no answers showed up I decided to do the search my self. . . Here's what I found. Due to the life cycle of the fiddler crab it is going to be pretty hard to get any of the eggs to hatch and survive. The crabs hatch and go to deeper water, some think it needs to be salt water, for a time and then when the time is right they return to land or marsh. If you just google "fiddler crab eggs" you can retrace my steps and find out for yourself.