When it looks like a big bump on its head its fine,like on the cartoons when they bump their heads,but once it starts looking like a ball on his head thats a no go.
bump=fine, beach ball=not attractive
btw are koks bony or fleshy?would that thing still be visible if you took, lets say, an x-ray of the fishes skeletal structure?Or if it died and you had the skeleton cleaned?