My biggest tank is like that. It started out as a planted community, and looked nice for a little, then it got all straggley, and I didn't like where the wood was, then it got algae...... so i pulled out all the plants and went for slate and other rocks..... didn't like that. So started from scratch (digging 3" of gravel out of a 40 gallon was no fun, especially as i had to stand on a stool to reach the bottom) and did it as an African Malawi cichlid tank..... spent a fortune on the fish and the rock! Looked nice for a while, but really doesn't now and i don;t know what to do with it. Might end up breaking it down completely again..... just can't seem to get it right.
Maybe because it's got one end to a window and the other end to a door - is that bad feng shui?