Maybe you have been in your local fish shop and have seen the occasional molly swimming
gleefully in a saltwater tank. You stop, puzzled. Upon inquiring, you learn that mollies often
live in coastal estuary and lagoon habitats, capitalizing on that middle ground between land
and sea. The store representative tells you that it is not that hard to convert such a fish from
freshwater to full strength seawater. You find it interesting, but move on. Most people that
invest in marine aquaria yearn for the brilliant colors typical of reef dwelling species, or …