In my case they hung around until the 4th month. All I did was blast them daily and fed heavy, reef roids helped with po4. I also used live phyto (not sure if it helped) I was tired of fighting, so I stopped and it worked it self out after about a month. I had zoas, a hammer, and an acan all survive just fine.
Perfect thats good to know. I'll cut out the dino x then and just try to keep maintaining it daily. I was considering getting some Phyto and Pods for a more natural approach. It's unfortunate that I can't do anything more for the SPS though.