Not much too it. I saved as much water from my system as possible. Had about 30 gallons of ready to go Scripps water just in case. I chucked the sand completely and put in all new. That's critical IME, once you stir up your sand its trashed. Replaced my zeovit completely and carbon too. Didn't loose any coral but a few fish died, probably from lack of air and stress. They were in buckets for 6+ hours. Some things browned out but color returned quickly.