I'm going to set up my 26G bowfront in my office at work, and I'm 98% sure that it's just going to be a freshwater tank due to maintenance reasons because I don't want the hassle of hauling water and stuff from home.

So now everyone here who knows me tells me that it'll only be a matter of a couple months before I switch that bad boy over to saltwater.

My question is.... If I went with a Fish Only tank and just decorated it with base rock, could I get away with tap water? What causes problems with saltwater made with tap water? I can see if you have live rock and stuff that there's all sorts of things on the rock that can cause algae outbreaks with tap water.

Or should I just take that 2% of me that wants SW at work and tell him to go fly a kite?