Today I did a water change and added some cured manmade rock to my BC29 and after doing so all my corals closed up. My zoa's, sun coral and shrooms all shriveled up and my frogspawn's closed and war coral all slimed. My birds nest closed up and everything just looks mad. The fish all seem to be doing fine along with my plate and GSP. My water test shows everything in normal limits but did drop water temp down to 76 but is up to 78 now and no change. The only thing I did diff in todays water change is adding a few small rocks and I did clean out the back filters where my media was because I noticed it had a lot of junk back there. Also I did use for the first time some epoxy putty that I got from LFS thats made for aquascaping. Anyone got any ideas of what it could be?