The 3 on the left look ok, it even appears that the one on the far left is expanding already. The others on the right appear to have a thin film on them, am I correct? If so, this film alone will prevent them from expanding. It's not going away, you can't blow it off with current, well you can, but why wait. You have to remove the frag and use a dedicated set of tweezers and remove every speck of this film. Give the frag the sniff test, if it has a very strong foul order, and the polyps underneath are mush, they are already dead. You must split the rock between the good polyps on the left and the decaying ones on the right. If there is no order, do a Furan dip. If you don't have Furan, you don't have time to wait days to get it. Perform an Iodine dip and separate the two frags. Place both on the substrate away from anything else. Don't allow either to touch any rock or corals. If you can QT them, that's even better.
It's true, I have always, always over the past 9 years, only ran my actinics when new arrivals are place. It's the best thing you can do for any corals that are just placed in your tank for the first time.
Believe it or not, when zoas won't open, it isn't always because they are sick, a predator is near by. It may not have anything at all to do with anything in your tank at all. Zoanthids are and can be temperamental. Sometimes, they just don't want to open, and they are still perfectly healthy. If everone on this board real takes note and document the appearance of their zoas for a full month, I can guarantee you that there will be days when some open and some don't. A day or two later, maybe even a couple of days, they are fine and expanding like never before. I make it a habit of keeping my tank and the room it is in completely dark every Wednesday. I have done so for years, and I have have notice that my days of polyp retraction for no apparent reason has diminished greatly.
All the best.
Mucho Reef
