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Good topic. I collect zoas/palys but I generally tend to go with Palys. Why, there are many reasons. Zoas are small, unless target feeding is a daily job. Palys grab food and close up most zoas don't close up even if target feed. I see zoas being more affected by nudibranches rather than palys (thicker skin?).
For growth, I feel the main factor that I don't think anyone mentioned (I didn't read the whole thread) is the diffrence from a wild colony to a aquacultured. I have seen my devils armor aquacultured grow like crazy, then I got a colony of fire and ice (wild) take awhile to get adjusted then open up with slow growth. Their not even rare zoas and the growth rate was slower than slow. I can vouch for this numerous times. But then again I did get a colony of ked redds to produce pretty fast after being in the tank for 6 months but that was a rare scenario.
For placement, I have great luck with a good flow (meaning the heads are moving gently)! Then I target them with a mixture of cyclopeeze, mysis, and brine shrimp! Anytime I trade or sell a frag pack individuals are always talking about how big the heads are that they got. Some of my colonies palys heads are as big as a nickel. But thats based on target feeding 5 days a week.
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