My sixline was a bastard! He attacked anyone new (even after changing the rocks) and sometimes turned on fish that were in the system before he came along. Then the heater broke and killed off everything (or so I thought). After taking out most of the water and running carbon for two weeks I filled the tank back up and....he was still alive!
Now he doesn't even pick on my anthias. I think every sixline needs a near death experience in order to calm down.
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