That would be me. I no longer do this as I have sharks now, but for the entire 3+ years I had my Reef tank I used nothing but tap. Well, minus the first year when I was using actual ocean water....which gave phenomenal results by the way. I haven't found a salt that produced those kinds of results since. But yes....I was nothing but tap. I did use a product called TLC to remove any amonia that might be in the water, but I never dosed anything in my tank. What is funniest about all of this is that there were several debates and conversations regarding why I had such tremendous growth in my tank....and when I was asked what kind of salt I used I would tell them, then they asked about the water and I would tell them and EVERYONE thought I was lying. Serious business dude....tap is what I used and got great growth from my zoa's, sps, and lps.