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Thank uMotörcrab wrote:Crabs have been digging on beaches, and other natural places for thousands of years before becoming pets. In the wild they can go much deeper than any tank. Their digging habit is the most nerve wracking thing that they do. If they come across something while digging they will simply go over, under, or around it. Crabs can stay buried for months and months.
The only time you should ever look for a molting crab is if there is some type of problem with your tank. The only two issues that require digging are flooding and bacterial blooms.
Flooding is when you get a build up of water at the bottom of the tank. It can be caused by over misting to control humidity, a leaking water pool, overspray from bubbles, or too high of humidity building up condensation.
Bacterial blooms are usually happen, but not always with the conjunction with floods. Blooms can happen when a crab dies while molting underground, or if food or other matter starts to break down. Blooms can also happen due to lack of oxygen getting to the lower area of the substrate.