Over time, the nutrients in your Nature Aquarium aquascape are used up by the plants. ADA Iron Bottom provides essential nutrients that can be absorbed by the plant directly through the roots of the plant. Iron Bottom is particularly good for Cryptocoryne and Echinodorus species as these plants take the majority of nutrients needed through their roots. Use in conjunction with a liquid fertiliser system. ron Bottom is a stick of nutrients, and it can be applied easily by inserting to the substrate. It provides necessary nutrient elements with iron, and helps to avoid whitening of the plants. It is also very effective for the growth of Echinodorus.