It is said that Clown tangs are very difficult to keep,but I brought mine when it was only 2.5", and that was over 4 years ago. Now its nearly 8.5"in my 150 gallon aquarium,and as it grows,it becomes more aggressive. However,for coloration,it's a beautiful fish. Whenever my Ct gets in an aggressive mood,its head turns dark looking like veins,then it swims wildly as if to say to the other fish get out of my way.