All Aquaforest formulas are adopted to dispense 1 measure spoon at 100L (27 US gal)of water. However, it should be remembered that each aquarium is different, depending of reef cast. By introducing new products to aquarium you should begin dispensing 1/2 (even 1/4) dose and observe how the corals respond. Then gradually increase the dosage to reach the target. Corals should be fed at night when they extend their polyps.