I feel that they have their uses. I have a bunch of cement in my tank. I have made some man made rock for the purposes of hiding large "Y' fittings and nozzles in my aquarium. I feel that it looks more natural than seeing piping in the aquarium. Many people that have come over and have seen the rock in person has been fairly impressed as you can't tell the difference once you have the variety of stuff grown and living on it. I have seen no negative effects in 15 months. After all, frag plugs are man made rock. They have all been encrusted over and hidden not in my aquarium.
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