Hippo tangs can grow quick. Mine went from 2 inches to 8 inches in 3 years in my 500 gallon display. Boss of the tank. Can be destructive too. He nips at multiple coral colonies I have , paces the front of the acrylic daily and has left many little scratches, bullies a lot of the smaller fish (luckily this is spread out amongst 6 other tangs). He’s become a pain in the butt honestly as he reached this large size, but also very beautiful.
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