Two Little Fishies AcroPower contains a blend of amino acids utilized by corals for the development of their skeletal architecture. Like other cnidaria, corals have a special ability to uptake dissolved amino acids across their entire surface. Closed system aquariums with protein skimming and other "ultra low nutrient" filtration methods deplete amino acids that are vitally important to coral health. Small polyped reef building stony corals of the genera Acropora, Montipora, Stylophora, Seriatopora, Pocillopora, and others become more colorful within days due the extension of the growing margins when AcroPower is used. Made in the U.S.A. 250 ml treats 1,250 gallons