What steroid can be used in flowerhorn fish for the growth of the head?

In flowerhorn fish, the steroid commonly used to promote head growth is called metandienone (also known as Dianabol). This anabolic steroid is believed to enhance muscle development and overall growth, leading to the desired head shape. However, it's important to use such substances cautiously, as improper use can harm fish health and lead to adverse effects. Always consult with a veterinarian or aquaculture expert before administering any steroids to fish.