Aqueon Aquarium Plant Food is essential to the vitality of aquatic plant life. Because these plants live in a relatively artificial environment, supplementation of key nutrients is very important. Aqueon Aquarium Plant food contains macro and micro nutrients which will allow under water plants to thrive and may even prolong the life. Micro and macro nutrients prevent yellowing, deficiencies, and unhealthy plants. This particular product contains sea kelp, an excellent natural source of potassium.