Totally understand the frustration with aptasia. I have both a filefish and a copperband butterfly that both seem to show no interest in aptasia. The copperband while in quarantine would eat them. As soon as it got its first taste of mysis, totally jumped ship. My system has a remote refugium with a dozen peppermint shrimp that seems to be working. After doing some research discovered that L. Wurdemanni species are your best bet. The L.boggessi, and the L. Seticaudata look very similar and generally don't touch aptasia. A reefer on another forum posted side by side pictures of them to distinguish the difference. There is still a battle in my display tank on some of the rocks I can't move to the refugium. Unfortunately I am quite confident my harlequin tusk fish would give my peppermints a warm welcome in the display. Tried last weekend mixing kalkwasser with lemon juice to make a paste, so far has has given me the best results yet. The aptasia I pasted are completely gone.
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