[aurora]

Your picture show a decent softies tank with low bioload. Your corals are all fairly high nutrient corals and appear happy in your tank. You've seem to have reach a good balance in nutrient import and export. I think there a lot of good stuff in tap water that may be beneficial to certain corals as long as you are aware that you are runninga high nutrient system and stay within that limit. However, beware of putting anything with lower nutrient requirements like SPS (except some montipora species) in the tank. BTW...is that a bleached open brain or gonipora in the foreground? Also, your few sps seem to be just hanging on or browned out as they typically will do in high nutrient setting. The problem with most of us is we want a tank stocked with corals and fish. That's where tap water become a problem because it adds more nutrient to the system than we can export. As long as you keep yourself under control and withing your limitation, I think you'll be fine. However, like most of us, the minute that you think you are "successful", a trip to the LFS returns with a few more fish and those bright/beautiful/must have/low nutrient corals...then our trouble starts...LOL.