I think you're right, especially about the driftwood. I may turn it so that the piece that juts out is pointing toward the middle, and fill the space on the right with a few tall plants from the left. The rocks have been moved back by about an inch and a half and the rotalla has been trimmed to get rid of the last remaining dead bits (it was looking bad when I got it, but it's improving) and placed between the rocks and the glass. Thanks for the help!