Sorry about the water changing, Snipe was right about that one. You should leave it, yes, top your water off and watch the salinity. In a smaller tank it can change with in a week or two if you evaporate quickly. And YES I meant 4 weeks! Two weeks is pushing it, especially with a smaller tank. I have one, and you would think that they are easier to keep, but you really have to watch you water parameters. Being there is less water, there is more evaporation and water quality can change quickly! If you introduce too much too quickly, you are just going to crash and cycle all over again. By all means, add one or two hardy fish in two weeks, but don't think you can stock your entire tank and add a cleaning crew and nothing bad will happen!