Well,this will be a bit of a read but bear with me! This has been going on in my tank now for more then 6 months! I am getting No coral growth what so ever. My acros have little polyp extension and just start RTN after a while, zoas melt, lps and anemones have little extension. Now, I am not new to this reef game (20+Years) and I have had some incredible growth in all phases of the the game but....something happened! Let's go back a bit. For many years my 60 gallon cube harbored an incredible reef. I grew out to great colonies of colorful millies, oregon tort, and various other acros along with hammers,duncans,zoas,chalices,acans etc. About 3 years ago we had a family crisis and I let the tank go on maintenance to the point that I was losing a lot of prized items! I removed most of them and handed them out to friends thinking one day I'll get back up to speed. Things started getting back to normal about a year and a half ago and I proceeded to get the tank back into shape. Drained it, scraped the rock, cleaned algae, skimmer sump, vinegared all the pumps. In March of 2013 I refired up the old girl and waited for the cycle to end, restocked and everything was going great. In June of 2014 I started noticing my sps with little to no polyp extension....no worries ...ran some tests everything checked out but I did a water change anyway (20% as always) there was a slight recovery and I thought everything was fine. Then the zoas closed up and wouldn't open and others started looking not so good also. Check parameters again (Cal,Alk,Mag, Salinty, Phosphate) all MORE then good...so I ran a little extra BRS Rox carbon and purigen. nothing CHANGED! Now, I have a 29 gallon a run in the basement with the same parameters as the 60 gallon. One difference ...the 29 is oover run with Caulerpa Racemosa. I move a bunch of the acro and a few zoas to this tank and....it a few weeks they are doing great! So I am thinking....I don't run a refugium on the 60 gallon(very little space) but I am going to try a small one and see what happens. has anyone else had a similar experience? I am just pulling out the little bit of hair I still have!