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I think they can eat lettuce but I would be careful putting it into the tank. Make sure you wash it really well so it does not have any chemicals on it. I just feed nori or seaweed salad to my tangs and coral beauty. They love it and it is much easier to work with.
Yes you can, but better yet try some nori. It is much better for them, will not foul the tank and can be had at any asian food store or maybe even your lfs. Its compressed seaweed and is used to wrap sushi. My Macalosus angel and yellow tank just love it.