1st things first... Post what tank size you have, equiptment as well... How are your water parameters? what coral are you talking about? ETC
I the tank was dosed copper before that is why you're having a hard time with corals. The sand and rocks can have copper on them. You pretty much need new everything if u want a to have a reef system
My setup is around 40-45 twv and I skim with a SWC-120. For the first month, maybe two, my sps would either languish or die. I couldn't figure out why. I would broadcast feed and it seemed to not do the trick. One day while feeding, I decided to target feed and my coral went crazy. A few more days of target feeding, all my SPS were MUCH better. It hit me that my skimmer was scrubbing my water of everything.
I now turn off my skimmer for hours and feed heavy and it has made a huge difference in my tank. My SPS are doing exceptionally well. Reefwise turns off their skimmer every night and I do the same since that's when PE is bananas.
I the tank was dosed copper before that is why you're having a hard time with corals. The sand and rocks can have copper on them. You pretty much need new everything if u want a to have a reef system
have u tryed it before u say it cant be done . im just saying lot of people say u cant do stuff and people always proveing them wrong. i saw a tank on here he said hasnt done water change in 4 years people say impossible well he did it. i ve treated my whole tank with copper twice sand rock all equipment every thing never changed a thing . its been a sucessful sps reef for over two years. just using some carbon to get most cooper out . i stir my sand all the time. still good over here. just saying if u havent tried it hard for u to say it wont work. when i know it can be done first hand.
hahaha. I wouldn't try dosing my reef tank with copper! are you crazy!!!
Why would I put copper in my reef when hundreds of tanks out there have lost all their corals or unable to grow corals with copper in their system.