Crystalpro / Reef Colors Liquid mineral supplement for reef and marine aquariums Reef Colors; is a balanced blend of macro and micro elements required for coloring and healthy growth of corals and invertebrates. Use with Reef Basis Minerals for better coral growth. Instructions: Add 1 ml to 100 liters (27 gallons) once or twice a week. 125 ml is enough for 12,500 liters (3300 gallons) Cautions: Keep out of reach of children. Not for human consumption. When eye or skin contact, wash with plenty of water. Keep it cool. Do not freeze. Approximately 15 drops is 1ml, a bottle cap is 7ml. Shake the bottle well before use. Do not overdose. In this case, change the water.