There are no red bug predators on zoas that I know of.
To be on the safe side set a gallon of dechrorinated freshwater aside and dip them.Set the pH and temp close to the display.Dip them for 5-10 mins before placing in the display.If you see any white swirly sacks(nudi eggs) then pick those off with tweezers.Freshwater dip will not kill egg sacks.I've done this for all zoas/palys I've purchase over the last year,it won't harm the zoas(piss them off,maybe).I spent months a year ago trying to get rid of nudibranches on my zoas,never want to go through that again.