if their like mine their bigger then golfballs lol when targeting them you need to make sure the coral can handle their roughhousing,weight,friction and whatnot for me my coral was a goner so i had nothing to lose ,you can get small turbo snails im just not sure you will see the same results, mine just had babies so im not sure yet on how they will do for my tank i got probably about 50+ in a 33g and they are gettin big fast ill be giving them away soon and putting them in other tanks
i have the same problem mostly on smaller zoa frags with just the odd strand coming out i pull it when i see it and i know for a fact it will take over as i have lost zoas before like that