plants and salt

Well, I just got a Caridina gracilirostris from my LFS and I am suspecting he was a stowaway since there are no brackish aquariums there. He is a cute little dude and if I take him back he'll probably die, as I do not think they'll bother setting up a brackish tank just for him. I am prepared...

In short, my question is what plants could I keep in a brackish tank (with a salinity level of 1.008 sg) with aragonite sand and a fish that digs? What about plants that red-claw crabs can't destroy? Semi-aquatic plants?   More details...   I currently have a 6.5" or so Violet Goby (Dragon Goby)...