So I could have done the worse water change this past weekend on both my tanks, it started when I have yet to find one of my clown fish from my 20 gal. I started with 3 I am left with 2. Now I go down and check on my 180 gal and the last SPS coral I had for 2 years is bleached and some of the Xenia which is roughly 6" away doesn't look good either. Never trying is ok, now I need to find a SPS frag to replace it.