What about good types of plants? I currently have a sword, some anacharis, a crypt, and some dwarf sag planted, but I'd like to add some more. I'm a little leery of keeping the anacharis in there, because they grow fast and tall, and I don't want to have to be in there disturbing the shrimp that frequently. I have a relatively short tank as well, so something that would stay lower would be ideal.
EDIT: Forgot to mention I have a bit of java moss there as well. Can that be planted in the sand for a carpet-like effect or is this not recommended? It's attached to the lava rock right now.