I have a 20 tall that I set up after downsizing from a 55. So basically the tank has been up for a year. My problem is some corals do great and some do horrible in my tank. I have about 100 polyps of radioactive dragon eyes that do great. Another brown colored with white spot in the center ZOA that has went from 15 to about 35 polyps. Frogspawn that opens great. A few other zoas that do fine. GSP does great. Almost covered one rock. I bought some frags from a fellow reefer two weeks ago and at first were fine. Now the candy cane looks shriveled up and just doesn't look as full as it did. My 4 polyp bam bam frag has only one polyp that opens. Another frag of fire and ice doesn't open good either. What could cause this. SG is 1.025. Amm, Nitrite and Nitrate are all zero. Cal, Alk and Mag are high. Did a four gallon WC tonight with instant ocean tonight to try and lower it. Was using Red Sea Coral Pro.