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Yes, they must molt in order to grow.
Jellyfish have no skeletons so they don't need to worry about it.
Grasshoppers have a hard exoskeleton so to grow they must shed it.
Here are the needs for sugar reed to grow: Water needs to be next to it. 2.: Must grow on sand or dirt (sand is faster)
Nymphs must molt because as they grow older and larger their exo-skeleton becomes too small and they must shed it or molt it away to allow for more growth
sicret
advantages: superb protection, (like armour) camouflage disadvantages: must molt to grow, leaving unprotected temporarily
A crustacean is any arthropod with what is known as an exoskeleton. This means they must molt to grow. Examples include lobsters, crabs, and even shrimp.
Hermit crabs are considered to be in the arthropods family. Hermit crabs have a hard exoskeleton made of chiton which helps provide protection and give the muscles attachment support. Although a hermit crab will grow, their exoskeleton does not so they must constantly shed said exoskeleton in favor for a new one that it grows into.
Hermit crabs pull themselves up into their hard shell. Other crabs must just get away as fast as they can.
Those must be quite unusual. I've never seen any with crabs.
There are crabs which breathe water and crabs which breathe air. It is rare to find a crab that does both but intertidal crabs do but they must remain wet to breath air (strange, right?).