I've always liked the six-line and have seen very little aggression from them. Th only time I have was with a diana hogfish that was essentially the same size and very close in colouration. Even then the aggression was limited to some occasional chasing around the tank.
I find them to be intelligent, inquisitive fish that add to the rockwork by always weaving through every possible opening. I had one that would play in the stream of the powerhead, doing little figure-8's. My only regret with keeping one is that I cannot have a mandarin.
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