copperband butterfly, filefish and bergaria nudibranch are the 3 that come to mind in terms of natural predators. it seems like once the aptasia is gone each has their own difficulties in keeping though.
alternatively, kalk paste, lemon/lime juice and boiling water are the usual reef-safe implements and then down the list to aptasia-x.
i've never had a big issue with aptasia but these are what i keep coming across as solutions. perhaps someone here can provide help as to what works well and what doesn't.
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