By washing your hands thoroughly with germicides.
Rinse out their cage with water, and rinse the sand. Or buy new sand when you're ready to replace it. Otherwise crabs don't really get dirty.
rabs can live in clean or dirty water
If it is kept clean.
If they don't clean the beds off yes, which is just nasty.
Yes you can keep crabs as pets....you can buy fiddler crabs and hermit crabs in most pet and aquarium stores.
In the Chesapeake bay, blue crabs eat and mate.
basically, whenever needed. check daily for anything wrong in its cage. change food daily.
Hermit crabs do need both types of water but they need both water because they need to clean themselves and they just drink salt water.
Hermit crab mites are like head lice for crabs. They are small wingless insects that crawl around inside the shells of hermit crabs. And, just like lice, they have nothing to do with how clean or dirty the habitat or crabs are. Mites can hide out in hermit crab toys, bedding and even food.
They are somewhat common depending on the habitat you have available for your hermit crabs. Mites are generally attracted to moist, humid areas. But they won't be to much of a problem as long as you clean your tank regularly and bathe your crabs weekly
Some types of crabs I know of are fiddler crabs, hermit crabs and horseshoe crabs.
Mostly asian shore crabs, Mud crabs,Rock crabs, Donut Crabs and Spider Crabs. I believe there are no freshwater varieties.
rock crabs are type of crabs.