Marc Weiss Blackpowder 4oz Powder is almost totally absorbed and utilized by your reef life without undigested particles being leftover to pollute! Enhances growth and reproductive potential in organisms that are deprived of missing enzymes in the captive reef Contains high levels of available calcium On target, direct pigment priming and growth enhancement! For advanced hobbyists and professional applications to maximize growth and color in anemones, tree corals, xenia, sea squirts, cucumbers, sea apples, zooanthids, large and small polyp stony corals, goniopora, sinularia, carnations, euphyllia, monastrea, millepora, many filter feeders and cryptic organisms!