Pods are generally good in a reef tank, I have never seen pods feeding on zoa myself but just like all living things some might just become rogue predator. Make sure you examine thorougly for zoa eating nudibranch or spiders and if you are certain that the pods are the culprit then either use interceptor (vet prescribed dog de-worm pill) to nuke them or get some wrasses or mandarin fish as a biological control, I would perfer the latter but its up to you. I like my pod population to be high since they eat all the left over crap sorta like an army of miniture cuc.
Good luck
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