The treatments I always followed were 1 treatment a week for three weeks.
Cant believe this seller would sell pox infested frags as well as one with hyrdriods as well
Thing is sometimes they'll just catch it as part as shipping stress, especially if they show up a day or two after they're in your tank. Always a good plan to put new zoanthids frags in decent flow to get any shipping bacteria and slime off of them.