Ok, thanks for your input guys. I'm going to start looking for something to fill in that area. Right now its occupied by an experimental terracotta pot that I sewed a net sleeve to cover it and laced it with java moss-it was supposed to hide the fact that it was a flower pot and look like a moss cave but it's not doing too well. I'll ax it soon and get a grassy plant.
I was also wondering, what do you think of an aponogeton bulb in the right corner? My betta likes to sit right under the surface but only when there's cover for him, so I was thinking of planting a bulb and letting it grow leaves to the surface for him. I planned on selectively trimming them to keep them over to the right half of the tank, which would protect the african fern from getting too much light(it really seems to hate light). What do you think??
Thanks for your input and I'll keep you posted with pics as it fills in. The Java fern was pearling quite a bit today.