Has anyone ever looked into live rock for an African Rift tank? After using live rock in my salt water tank and seeing the improvement in water quality, and also seeing how happy our cichlids are after we added huge pile of rubble in the tank (they stopped destroying each other), I've been wondering. I don't even know what type of rock is found in the rift lakes, but the CaCO3 type of rock with all the holes and tunnels you get for reef tanks would look nice, help stablize hardness and perhaps lower nitrate levels. Of course, none of the organisms on reef rock would survive in an African tank, but maybe there are other organisms in the rift lakes? Just a thought.