Try anubias. grow well in my 0.9wpg tank. Also I have java moss, hygrophilia polysperma and vallis. These grow slowly, but they do grow. I also have some riccia floating at the surface right under the lamps. It seems to be in a state of stasis as it's neither grown nor died off in the couple of months I've had it. It does pearl nicely now and then though.
WK