It is important to clean your crab’s tank regularly and comprehensively. For larger groups of crabs, cleaning may occur more regularly; with more modest situation, once a month or every few months for a deep clean can be possible. There are a variety of tasks which should be taken care of almost daily—common-sense-type activities including cleaning up obvious messes or debris in the sand. The deeper cleans require you to move the crabs to a temporary home for a day or two while the substrate, shells, toys, and entire tank are cleaned and disinfected, through boiling and other methods.