CKs start TRYING to eat fish that do not even fin in their mouths at about 20 inches... An example is mine when he was id say 22 inches chomping a 15 inch arowana to death... He just keeps chomping until it dies and leaves it to rot... Also he killed a 8 inch oscar when he was only 17 inches so watch out... They do not JUST eat what fits in their mouth... People say never trust a catfish but I say never trust a clown knife... My latest incident was my clown trying to kill a 15 inch florida gar. Luckily i caught it in time...
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I could vouch for this, CK are now starting to be known as an invasive species here in the Philippines, they're munching on Milkfish, a livestock here. Those Milkfish can grow up to 2 feet, also may have a considerable girth. (well that's the size when they're on market dunno if the can grow more)