Don't know about Seagrass Filefish, but I bought two Tasseled Filefish (Chaetoderma pencilligera) on the suggestion from my LFS that they might eat Aiptasia, based on reports from European reefers. They didn't. But it's all good. They are cool fish regardless, and two of my favourites. And I managed to get the Aiptasia under control by zapping them with Kalkwasser; scrubbing the rock; and introducing a small army of Peppermint shrimp (about 12 in a 180g). Haven't seen one Aiptasia in a long time.
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Mark.
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