Thank you Kathy, that's what I was doing until now. Guess I'm reading too much :splitspin . This article was from a reefer with 17 years salt water experience and with other tips he mentioned "don't forget to use good water stabilizer with every water change". So I assumed I'm missing a step.
Recently I messed up. I started to have a cyano algae problem and couldn't get rid of it, another research and I bought "chemiclean" what was the sure thing to get rid of. I hate to use any chemicals, but I was desperate, it was spreading and covering my zoas. So I used proper amount and supposed to do water change in 48 hours. Well it was a disaster. I didn't event wait 48 hours, because everything was dying. I did quick 20% water change, next day another, but my SPS were getting white, zoas were closed, whole aquarium looked like a desert seen. Not pretty site and it was Christmas. I felt like my aquarium babies were screaming :iamwithst .
I was afraid I did the water changes to fast and made the matter even worst, then I read about the stabilizer and finally decided to turn for help. I know, should do that before the mess. Now I'm just waiting, SPS's are gone, zoas are slowly opening, only thing not affected by this are fish and acans (thank god) I thought they will go first.
Well this is my story, hope somebody will learn from it, I know I did. No more chemical even when you are desperate!!!
Today some polyps on SPS are starting to open. Is there any chance they can come back?