I bought 7 corals from a local reefer on kijiji. They are: Kenya tree, Red Mushroom, Finger coral, Acropora yellow/green, Orange birdsnest, ORA Teal Birdsnest and Montipora Danae. I got the corals on Oct 20. They all had great color to them. Now, a few of them are bleached/bleaching, or going green. I only realized how bad they looked compared to when I first got them, when I looked at old pictures of them. I moved the corals that started bleaching, to lower locations in the tank. Here are some before and after pics: Birdsnest before Birdsnest now: it's a little hard to tell, but the only color to the coral is a greenish tint. Also, the skin seems to be peeling? Acropora before Acropora now (the danae in this picture is not as light as the picture below. The light reflects off of it in a weird way) Kenya before Kenya now Mushroom before Mushroom now Finger coral before (it was only on the sand because it fell) Small birdsnest before Finger coral and small birdsnest now (yes, I'm aware of how bad the kenya looks now.. I was thinking it was dead, but didn't want to remove it just in case it wasn't. My tank parameters: Temp: 80F Salinity: 1.027 PH: 7.8 Ammonia: 0.25 ppm Nitrite: 0 ppm Nitrate: 0ppm dKH: 7.3 Calcium: 370 Anyone know what's happening? :/ Any answer is greatly appreciated!