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the trigger & the damsel have been in there since i have had the tank i have tried to capture them but its a big tank and there quick i have never had a problem with the octo and the fish when the octo comes out the fish hide or stay out of his way
they might not eat your corals but they will eat ANY inverts in the tank including hermits,shrimp, and octos. their teeth are designed to tear limbs off of crabs and slice through soft flesh of other fishes... trust me ive seen them in action eating everything! he will eventually start eating the legs of your octo slowly but surely