sera Flore set - Complete SystemGerman made set including entire system of plant additives for the best experience to grow healthy aquatic plants at a cost effective and convenient rate. This set consist of the following 4 bottles in 50 ml each which complete each other: Flore 1 Carbo Prohibits algae and additional carbon (CO2) for optimal growth Prohibits the growth of algae Alternative carbon source Reduces diatoms Flore 2 Ferro Additional iron for splendid color development