Just thought I would make a quick post that might be helpful to someone I recently had a heater go bad on me in my rodi water and before I noticed did a water change on my aquarium. Needless to say I lost alot of snails because if it and 2 frags which all things considered wasn't too bad. I tested my water the next day because it was real cloudy and found that copper was of the charts and found the burnt out heater. I quickly did a water change with new water and ordered cupisorb on Amazon and luckily it arrived the next day. After 24hrs of running the cupisorb my levels were back to normal. I do believe cupisorb saved me a lot of other coral death as now they have all bounced back and are doing great. Just wanted to let anyone know with a similar problem that stuff works great!