Well I got given a used sterilizer which I ran some water through for 15 mintues. Bought a Maxijet pump for it and put it in my tank... The next day I came home to find my tank VERY dark, when I pulled a sample of water it was as dark as when you rinse your carbon for the first time.
After a 50% water change, pulling the UV sterilizer, and adding lots of new carbon I ended up losing 5 fish but no coral.
