Well you would have to say they have claws and are coloured in red or orange and obviesly they both live in the sea but some are fresh water.
A crab that lives in the shells of other shell fish is called a hermit crab.
fish
it depends how big the hermit crab is or the fish bowl
yes it does eat fish
I think that the larger fish eat the crabs when are out looking for a shell ,shell-less. But also it is possible to have a smaller fish eat a crab shell-less depending on the size of the crab.
fish
no
plankton
Fish.
lined butterfly fish get eaten by by crab fish.
fish have scales and crabs have a shell
fish have scales and crabs have a shell