Flourish tabs are a fertilizer for your plants in a solid form. They will stimulate your plant's growth becasue they contain all essential trace elements, amino acids, and vitamins. They are also rich in iron, manganese, magnesium, calcium, potassium, inositol, chlorine b12, biotin, and other factors that have been determined to be beneficial to aquatic plant roots. Importantly, the tabs don't have any phosphate or nitrate so you can rest assured that they will not promote algae in your tank. Each pack of 10 tablets treats a 12" x 30" inch plant bed two times. For best results, use in these tabs together with other liquid fertilizers.
All around, these are some good tablets to add in supplement to your substrate. Been getting good growth out of them