I know what you are thinking, "of course not...."
But listen to this.... Long story short my LFS
tested my water(returned a dead fish) and low and behold my water sample held 0 GH
Very confused I came home and ran the test myself on my tap water multiple times, every single time- Zero.
My water is basically as soft as physically possible. We have city water then it goes through a couple house filters.
Of course my water also has no traces of ammonia, nitrite, or nitrate, could it be possible, to run a healthy reef on this tap water?
I just took down my reef a few weeks ago and WISH I had known about this sooner.