Description : 2231434053_6416915013 Flourish tabs are a gravel bed conditioner for your planted aquarium. These tablets are slow dissolving tablets designed to be inserted in the gravel bed of the natural freshwater aquarium. Each tablet contains a rich assortment of important trace elements; vitamins and amino acids. They are rich in iron; manganese; magnesium; calcium; potassium; inositol; choline B12; biotin and other factors that have been determined to be beneficial to aquatic plant roots. Contains no phosphates or nitrates that would promote algae. Each bag of 10 tabs is sufficient to fully treat a 12 in. x 30 in. gravel bed twice.