QUOTE(ahtiven @ Jul 18 2008, 11:58 PM)
thanks for the advise on-screen and prophet.
now my biggest hermit crab seems like want to molt. he dig everywhere and it looks totally chaos!
i can see he has dug one fav hole enough for him to go in and out, but he still crawl out from the 'cave' very often. maybe its not the right time yet.. but soon i guess.
The digging means they are in the hunt for the most cooling spot for a proper molting. Also, yes, they come out of the hiding spot usually for food and water then goes back in. Sometimes it carry the food along to the spot even and dont worry, they finish everything left in the hole before coming out.

Added on July 20, 2008, 8:22 pmQUOTE(blitzboy @ Jul 19 2008, 08:48 AM)

Yes ! Sand is a must ! It helps the hermit crab to create a safe environment for molting.
A land hermit crab physical body structure are evolved in such that adapted to walking a variety of terrain from sand, rocks, and even up to climbing trees. But when it comes to molting, sand is necessary to ensure a successful molt.
Naturally, when a hermit crab is about to molt it will remain buried in sand either fully or partially with a tip of its shell sticks out on the sand surface, with the shell opening face downwards and buried.
When the molting completes, and the exoskeleton hardens, the crab will emerge again from its buried state and resumes to its usual habits of walking, eating, climbing, digging and always on the look out for new shells.

+1.
Additional info : Suggested height for sand substrate is your crab height + 2 inches = the amount needed. The standard height is 5 inches minimum while 8 inches is the highest you can go. Some went for 10 inches and you will find your crab hide in the sand more than on the surface.
Also, sand give good humidity control to the crabitat and it ensures the crab in a comfortable environment. It do give a natural feeling to the crab and serve and an exercise tool as the crabs will go digging around till kingdom come

Choice of sand : fine / refined sand, filtered beach sand. Do not use coarse riverbed sand as those will hurt the crabs abdomen. Colored sand is best to avoid at the moment.
Tip : You can mix other substrate with sand. For instance, sand with crushed corals, that will make the crabs "feel at home". Make sure the corals is well washed as the crabs usually pinch those for their minor calcium supplements.
This post has been edited by onscreen: Jul 20 2008, 08:22 PM