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Aptasia is considered an anemone right???? When all the aptasia are gone wouldn't they go after another anemone?
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Sea slugs and nudibranchs are very specialized feeders, and Berghia in particular are obligate to
Aiptasia spp to the point tht without them they will starve to death. Almost all nudibranchs are very VERY specialized feeders, matching their camouflage to their food sources and often found only in areas where whatever their obligte food item lives. See Bill Rudman's
sea slug site for lots more info on these interesting creatures.