I couldn't tell you the growth rate, but I will say they aren't skitish tangs. (like a purple, powder blue, or achilles) Mine really rules the tank, but a quiet rule! He's bigger than everyone else, and just cruises. I will say that when I first put mine in my 180, I felt like he was too big for the tank. It's my favorite fish, I love Nasos, but I wish I had a bigger tank for him.
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