I don't know of any predators that eat sundial snails. There are however some predatory snails that eat other snails but not sure how you would get one of those. Just look at your zoo colonies and if you see sundials, pull them off.
I'd rather have sundials than nudibranchs.......the nudis are a pain to get rid of especially the eggs.
Luckily the sundials do not propagate well in captivity and you can easily contain them by manual removal. They will suck zoas dry if not taken care of.
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