That is weird about the gorgonian polyps turning brown. I'm not sure what causes that to happen. I had bought a couple of zoomed powersweeps when I first set up my tank a while back and they worked great for a while but after about 6 months the sweeping motion would start to lock up and they soon became either locked in a fixed position or the nozzle that sweeps would quit sweeping and you would have to aim in a certain direction. A few months later I just tossed them. It is a nice concept but I think it has too many moving parts which means too many things that could break. I hope that they have improved the durability of these powerheads and I hope you have better luck with them than I did.
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