About 2 or 3 weeks ago, I noticed my yellow polyps were not opening all the way. Then my clove polyps started not opening. At this point, not any of it's (clove)polyps are opening. My xenia is not pulsing very fast. I bought some zoo's last week and they have not opened yet. Actually, none of my corals are looking great at this time. To make matters possibly worse, I changed from 130watt PC to 175 MH one week ago. My tank is a 20g and the water test are as following: PH=8.3, kh=13, ammonia =0, phos.=0, nitrate=0, cal=340, temp=78NT-80DT. I dose with ArgraMilk daily and add a few drops of mag. and trace elements weekly. I have dose this for a long time with no problem. Any advice would be appreciated.