Bolbitis heudelotii also grows attached to wood and doesn't mind lower light, it does better for me when it's in an area with good water circulation. There are several types of java fern you can use: regular, narrow leaf, windelov, and tropica are a few. Also there are many types of Anubias with different leaf shapes and sizes. If you look in the Plantfinder in the gold bar at the top of the page and search for epiphytes in "Aquascape Placement" you'll get a nice list of plants you can use.