In the wild, yes. And I also told you people numerous times that we will upgrade to a big tank. But in aquaria I heard they normally get to about 18-20 inches average. Max at about 24. We are planning a massive 375 gallon tank for all the fish together and once we get it my family will get extra powerful filtration. My Clown Knife is growing quite fast right now at about 10 inches. Once my fish outgrow the tank, we will upgrade. The fish will be housed in the 375 for life. Would it be enough? 96 x 30 x 30. And my Clown Knife is on a diet of live feeder fish. My Clown Knife is very healthy and has beautiful coloration, it is eating fine and it will go out to explore the tank. Anything else to add to make my Knife happy besides a new tank? Any specific substrate? Any extra types of food to give it once in a while? Any tank conditional requirements? Anything needed? By the way I'm just 12 so please don't be too harsh on me.