I'm becoming very worried. What happens if a crab is burried and the sand starts to dry out and collapses on them. Here's my problem: I usually have to wet my sand once a week with salt water to keep it from drying out. I wet it and mix it around until it's just moist, the way it should be. Well, I have 5 crabs that are burried and I assume they're molting. So I can't do my regular routine. Now the sand under the top layer is really drying out in some spots, and me not knowing exactly where they're burried, I don't know if it has or will collapse on them. What will happen??? What should I do???