Just put together my 55gal tank on 28 June 2012. I filled it with tap water (I know.. bad idea) and have had it running with the heater and the filter (Fluval 306) since that day. I know you're not supposed to treat "base water" with chemicals (declhor, etc..) if you're going to use it for salt, and I haven't. I was wondering how long it takes for the tap water to be safe enough to start adding the salt in? I know if left alone and open, the chemicals in the water will evaporate and I have the filter set up and running to help with its process. I've done a TON of research and I have 2 reputable (not "big box") places to go for quality fish and support. I'm going to keep the tank simple.. 45-50 lbs of live rock, 3-4" of buffered substrate and minimal fish load. I'm going to get a powerhead to move some water and a quality HOB skimmer of course. The species of fish I'm going to get first is a dwarf lion/zebra fish (not the fuzzy one). Then possibly 2-3 more compatible tank mates. I'm up for any and all comments and suggestions and no offerings of advice will go unheard. Thanks and I'm looking forward to getting to know this forum community.