Once upon a time the way to start a marine tank involved introducing a few hardy fishes and waiting until the tank “cycled.” The wait to establish an active biological filter often lasted one to two months! Nowadays the startup of a marine aquarium is so much simpler, and fast too! Two Little Fishies BioPronto Marine contains cultured naturally occurring microbes that rapidly start the biological filtration process. Use it to start the nitrification cycle in new aquariums or to enhance nitrification and denitrification in heavily stocked aquariums.