As you can see in the first picture I had a nice zoa garden growing with the green zoas covering the bottom right rock. In the second picture they are almost all gone. The red ones are still doing well but I have noticed that the skirt/tentacles aren't as long as they used to be on the red ones. The first picture was taking January 11 and the second picture was taking March 8. Since January they have been slowly disappearing and I can't figure out why. The Nem in the picture didn't split until March 8 and prior to that it hadn't moved an inch since the first picture was taken. I've been testing my water parameters which hasn't changed much if at all: NO3~0, PO4=.06, Ca=420, ALK=9.2, Sal=1.0255, Temp=77, PH=8.2, Mg=1420. I haven't changed my LED intensity, I did add a Vortech on the other side of the tank, but that just replaced a powerhead that I had there before. Just about everything else is growing in the tank. My Acros, Montis, Duncans and ricordeas are growing...... slowly but surely. My acans haven't exactly been themselves but they bounce back. My war coral is the only one that's receded along with the zoas but it seems to be making a recovery. I have also noticed some cyano starting to show up on the sand. Does anybody have a theory or an idea of what's going on and how I can try to save them?