people feed their fh food containing hormones just to increase the size of the head or to make the color more intense in a very short period of time..this is widely practised in thailand as the food is readily available..this reduces the lifespan..u should always go for known brands when it comes to food like hikari or nls..these vil bring out the colors and head and moreover vil keep ur fh healthy..and overfeeding to beef up ur fish is also bad as mentioned earlier.