Fritz has decided to introduce their popular F/2 Algae Food into more applicable sizes for hobbyist use. “Super concentrated, easy-to-use liquid form for accurate dispersion. Eliminates the time required for weighing numerous minerals and trace elements. No more need to be purchasing large quantities of chemicals and tying resources in inventory. By having an already made formula allows the aquaculturist to devote precious time to culturing organisms, not using an analytical balance.” This is the original 1957 Guilliard’s formula and is used extensively in aquaculture and even in culturing algae to make biodiesel fuel. A 16oz bottle for part A is $6.99 while part B is also $6.99.