Up to 2 small ones or 1 big one.
2-3 small hermies
A lot
I'd say no more than 6 medium sized crabs in a 55 gallon tank.
It depends upon the size of the hermit crab. You can fit 5-7 small crabs in a 10 gallon tank but only 1 or 2 large crabs. The more room you leave for your crabs the happier and healthier they will be. be careful not to overcrowd your tank, cos the hermits can get stressed, and may leave their shell or crawl into a corner and sulk :) But probably two or three would be enough room
No, hermit crabs like many other creatures have exoskeletons.
Zero. Hermit crabs lay eggs.
yes they are protected in California as California is kind of a tropical country with many seas and they are many hermit crabs which represents California, thus California protects the species of hermit crabs
I'm not sure what you mean by this question. Hermit Crab is a term used to refer to many different species of crabs that live in shells that have been cast off by snails. They can be marine hermit crabs, or land hermit crabs. Within these categories there are many different species. The Genus Coenobita contains 16 different species of terrestrial (land) hermit crabs. The Genus Paguras refers to those species of marine hermit crabs.
Only 3 to 5 at a time. I own hermit crabs myself , so I know what they are like and how many you need :)
There are not many hermit crab predators. Their shells protect them. Man is the greatest threat to hermit crabs.
in the hundreds
You already know what temp, humidity, kinds of water, ( if you don't google how to take care of hermit crabs) You can have alot of space like 3 small hermies in a 10 gallon tank and have diffrent shells, climbing toys (not too many) diffrent foods (hermit crabs are scavengers they can eat people fruit and veggies).