I have a 90 gal tank with a corner overflow. A wet/dry for up to a 300gal tank, with a protien skimmer, and 3 media drawers. I have carbon, carbon-phos mix, and phos pads, and media balls, and a 1300gph pump. The protien skimmer pump is aprox 300gph with an air pump. A 300 watt heater, and 4 floresant lights. I currently have it set up as a fresh water ciclid tank. If I put metal halide lights on it would I be able to switch the tank over to a salt water tank?? I have never had a salt water tank, I would like to buy a 125 or 180 gal tank and switch over the filtration setup. Do you think this setup would work on a 125-180 gal tank? Or would I have to get a larger pump?? Also is a 300gph pump large enough for a protien skimmer?? ANY INFO WOULD BE GREATLY APRIETIETED. THAKS!!!!!!!