I have a large tank with large CA cichlids. Right now, it's just a big stump, a pile of manzanita branches, and sand. I want to add some caves, or some vertical structure, maybe a rock piles, to give a few places for fish to get away from their tankmates--maybe get some breeding going on. I don't want to fill the tank up with flowerpots, I want something that looks cool, too. My tank's acrylic, so I'm worried about having a bunch of rocks leaning against the sides scratching it up. Any ideas? Pics of your setup?