I have about 10 to 12 different types of Zoa's in my BC 29. My water quality is not that pristine, but they seem to do fine. I have blue hornets, purple hornets, cherry charms, bam bam's, devil's armor, magicians, ked reds, jokers, lunar's, eagle eyes, dragon eyes, and some pink paly's.
I started out with single or just a few polyps for a number of them. I lost some in the beginning. I would turn on a flashlight at night and I would see a couple of amphipods on them and they were basically eating them. This happened to me a couple of times and I lost the zoa (especially the magician’s) My conclusion was that the fragging and travel process was enough stress on them that the zoa weakened enough that the tank critters sensed it and ate them. I then went through a better acclimation process after that and elevated some more sensitive types of frags on a piece of PVC pipe for a couple weeks in an area where the amphipods would not likely get them, and I haven’t lost any since then. I’ll put new additions on a frag rack, and if they don’t open up within a day or two I’ll move them to the bottom quickly.
I have noticed that each type of Zoa has it's own preference from lighting to water flow which contributes significantly to their growth rate. Lighting has been the most important factor for me. When I upgraded my BC29 to LED’s, most of my zoa's did well, but some them did not take well, such as my Lunars which almost disappeared. They could not take the led lighting. I moved them to the bottom of the tank and tried different spots but they were shriveled and looked as good as gone. Their mat receded and the new buds just disappeared. I just put the lunar's in a BC14 with stock lighting (placement at the bottom) and they have started to revive. My Devil’s Armour also do not like intense light. I was getting ok growth under stock lighting, but with the LED’s I have had no growth and any new buds that were forming prior to the LED’s just disappeared. I just put them in a BC14 as well with stock lighting and they seem to be growing again. It’s the same thing with my magicians. They also do not like a lot of lighting. I had zero growth with medium placement, but when I moved them to the bottom of the tank with the LED’s they started growing and I went from 5 to 10 polyps over a couple of months but they have since slowed down. I just put them in the BC14 with stock light at the bottom and they seem to prefer that lighting better.
On the other hand, my blue hornets and cherry charms love the more intense lighting. I started out with 1 cherry charm polyp from the September Frag SWAP and I have 6 or 7 polyps now. Similar experience with the blue hornets.
I dose iodine once each week for them. Other than that I just watch them closely and I use the growth rate to determine their happiness. If I am getting decent growth rate, I’ll leave them alone, but if not, I’ll move them around until I can find a spot that they are at least sustained and not receding back.
I don’t know if any of this helps, it’s just my experience with them, my main point is that each zoa or paly type is unique and you have to figure out what conditions it likes and a lot of it is just trial and error until it seems happy.