Brackish water plants?

I recently set up a brackish water 30 gallon aquarium with a puffer fish, a black tip shark (catfish) and two fiddler crabs with sand on the bottom. It has been up and running for a little over a month now. About 1/4 of the tank is a beach area for the crabs, and I need some help finding some good plants that like brackish water. My SG ranges 1.009 to 1.010 with water changes. I would like some sort of plant that would go down the incline from the beach area (mainly to help hold it together as I am tired of having to remake the beach area) and a couple plants to scatter elsewhere. Tank is about 17 inches tall. Any suggestions at all would be appreciated!