It's difficult to tell. My yellow tang sliced my beautiful male mandarin to death... now that bastard yellow tang is gone but that prove that you never know how a fish is going to react.
I woudl be afraid of the six line but you know your fish better than anyone and you know if it is aggressive or not.
I have a niger trigger that is a sweetheart and never attacked any one, not even the new fish I put in, so each fish is unique.
One thing is for sure...mandarins don't react to aggression and they will let other fish kill them without too much fighting or reaction.
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More fish die from human stupidity than any other disease...
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