I have both in a 120. My yellow is an ass. He is the biggest fish in the tank and was there long before the kole. The kole tang is almost the same size. In the beginning there was lots of aggression from the yellow. Every other day the kole had new cuts and scrapes. I put up mirrors to distract the yellow but it only worked temporarily. It took a couple weeks before the yellow calmed down. He is still the boss and doesn't like to share his nori, but they get along fine otherwise now. Good luck if you decide to try.
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