relatively hardy, good growth rate, generalist as far as light, flow, and water quality
just watch the zoa threads - one person will say " mine do great in high light" and the next will say "mine do great in low light " for the same morph.
some say high flow others low flow
- it all works!!
even the melt threads are varied - some say "this part morph are melters" while others will say "they do great for me"
the issue is simple - given reasonably good husbandry, shipping, and initial collection or fragging and most coral regardless of type will stand a good chance of survival.
If you receive a healthy zoa from a reputable source that was properly collected, handled, shipped, properly acclimated to aquarium life, fragged, shipped again, and received, they will do well.
none of the long time in captivity zoas, or any morphs that are frequently imported are considered to be difficult to keep by anyone.
Which is exactly why IMO they are for noobs/ people that don't want to spend alot of time on their system, or researching what specific types of corals need even..... yes they are colorful and can be nice to look at when grown out but a zoa tank does not require the skill, or care a full blow SPS tank does..... even if you want to compare a high end z/p tank to a high end SPS tank. If you get a healthy piece of most z/ps they will survive under most conditions, maybe not thrive, but they will generally survive, and yes if you take a healthy properly cut sps frag many will survive in most SPS tanks, but they are certainly more prone to unexpected deaths, and deaths caused by param swings then z/ps.
On another board I use, a guy couldn't figure out why his sps always died in QT but his z/ps flourished..... he showed a pic with 2" cyano covering everything, cloudy water, and a single unmodded maxijet providing all the flow, and when several of us said that the water quality had to be horrible among other things (low flow, poor lighting....) which was causing sps (from birdsnest to echinata) to die within 4-7 days he said he thought the pictures made it look worse then it really was and the water wasnt that bad because his z/ps were growing like crazy..... noob!
I have some garbage zoas that I had in an unlit part of my sump for nearly 2 years, pulled the rock out tossed it in my lit fuge and what do you know them dang things are still alive and starting to color back up (to green/brown).... I do not know of a single sps that could take that and come back/stay alive under those conditions! A few months ago I had a skimmer pump basically melt down in my sump, I lost ALL of my SPS (including the easier stuff), but not a single one of my few z/p's, and my shrooms/ric's all split as well enjoying whatever the pump put into the water apparently.