Two Little Fishies AcroPower, 1 Gallon Two Little Fishies AcroPower supplies amino acids that corals need to build their skeletal architecture Closed system aquariums with protein skimming and other ULN (ultra-low nutrient) filtration methods deplete amino acids that are vitally important for coral health Corals become more colorful within days due to the extension of the growing margins when AcroPower is used Dose 5 ml for 25 gallons once a week. 1 gallon (3,785 ml)