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How long has the undulated been in there. If he has been in the tank a couple months he probably thinks that tank is his. What you could try is to add 3 fish at once. That's what I do. Spreads out the hostility. Maybe try a lunar wrasse, a grouper, and a puffer. All will be pretty capable of a good defense.
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Good times and riches and son of a beaches ,i've seen more than I can recall
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