For your algae issue, lawnmower blenny has been proven to be the best fish imo.
As far as the fish fighting, it’s tough to say as each individual fish have different personalities. Some fish may fight in someone’s tank, but the same type of fish will be fine in another tank. It’s tough to predict who will fight and who won’t. Damsels are usually mean, but generally shouldn’t bother a tang much.
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