Can a hermatcrab fit in two gallon tank?

No, a hermit crab should not be housed in a two-gallon tank. Hermit crabs need a minimum of ten gallons of space, and even then, more space is always better. A two-gallon tank is much too small for a hermit crab to move around comfortably and to get the exercise they need. Additionally, a two-gallon tank can only hold a small amount of water, which is not enough for a hermit crab to soak in and maintain proper humidity levels.