It isn't worth it, IMO, if it is not calcareous rock (like off Florida where they have coral reefs). That is a very big difference. The rocks and sand are very very different between New Jersey and Florida.
If it is a granite or something (which is more likely in NJ), its just not worth it both because of porosity issues (it doesn't have it) and because of various natural minerals present in those types of rocks (iron, silica) that can encourage algae growth. Besides, a lot of the animals there are temperate water and will die off in a tropical reef tank. So do a lot of geology first!
Also, some of the biggest mistakes people make with things like temperate water snails and hermits is that many are predatory. Very common here in Texas, where people pick up the big ol' hermits in Galveston, only to find they are some of the nastiest around.
I wouldn't risk it, personally.