I'm going to be setting up a nano reef soon and I'm so confused on water. I know I can't use tap so what does everyone else use? I'm having a hard time finding a RO/DI system, that I can disconnect,that doesn't cost me an arm and three legs. It just seems crazy to have a system for 75 GPD when all I'll need is 1-2. I don't need RO for any of my other tanks. Are there smaller units on the market? What should I be looking for in a good unit? Should I just sip it all and get water from the LFS?