If it has a little hump showing at 1.5" its got a water KOK. If it doesn't its probably going to be hard.
So the only way to find out if the fry have water or hard Kok is to growout and cull? I have been looking online at these flowerhorn breeders overseas and they are always divided off. I know that will cause the fish to have more confidence ect... therefore their hump gets larger at a younger age right? I wonder if they divide them off as young as 1/2"? I am going to pull a few fry at that size to see if they develop any different than the ones grown up together.