I went out looking for replacements this afternoon and found a Senegal bichir. I'm only getting one fish for now until I can find a way to add some PVC pipe in the cave without destroying the scape. Bichirs can be a little fiesty when it comes to territory and I want all fish to be happy in their environment. Here's some pics. This little guy is only about 3" right now.
Now I need a new title for this tank/thread.