be used for saltwater? I have a friend who may sell her 55 gallon tank. They have had it for a year set up as freshwater. If I bought it, could I use it for saltwater? What would I need to do as far as cleaning it to make it ready for saltwater? Also what would be a good price? It is set up in a beautiful dark wooden stand. So just for the aquarium and stand. I would not be buying any of the filters or light fixtures obviously. Thanks!!