the kok size is all in the genes. your fh looks like he has a hard kok, a kok tht doesnt go really massive no matter what you do. you really have some experience in keepin fhs so why not buy some tht have big koks. super red dragons can be a start. if you want bigger ones, buy kamfas. their heads grow massive. thts how i play with flowerhorns. i gain experience bfore i go buy the more expensive and quality ones. they usually have it in most lfs.Thanks... any idea why the head is not bumped up? Any special thing needed?