Submergible?

[WookiellMonster]

Hey, so i went to the lfs and saw sum fidler crabs that i wanted. I asked the employee if they r submergible she said no. But me knowin that sum of the employees are not educated, i went home to research but the sites ive been readin are givin me mixed information.

Sooo do any of you have a fidler crab that stays under water?