Yes, I agree 100 percent with the above. If you don't intend to quarantine and observe, a FW dip is absolutely necessary, since zoas are one of the corals that commonly carry a few kinds of pests. I have had the zoa nudis and it is not fun!!!! Once they get into the display they are very hard to eradicate. If you dip and find nudis you also need to look very carefully for the eggs and scrape them off outside the tank. They are white spirals usually stuck to the outside of the zoa. FW dips will not kill them. Nudis are becoming increasingly common, I find them often on new colonies, especially aquacultured ones and WC that have been held with AC.
I FW dip in water adjusted for PH and temp for 5 minutes, and use a baster to blow everything out of the rock and between the zoas while dippiong.
If the system is a good environment for zoas they tend to be very hardy and I rarely spend much (if any) time acclimating them, but acclimation is never a bad thing!