Think about whether you really want to introduce additional nitrates into your aquarium in the form of artificial fertilizers. The unsatisfactory condition of plants may be caused not so much by a lack of nitrogen and other macronutrients, but by a deficiency of micronutrients (iron, manganese, boron) that are also essential for their vital activity. If your plants do not look very good despite the presence of nitrates in the aquarium water, this problem probably has nothing to do with a nutrient deficiency.
Always check the composition of the mixture carefully. The fertilizer should not contain phosphates and nitrates (usually the composition of the mixture is designated as N-P-K, where N, P, K are the percentage of nitrogen, phosphate, and potassium). Nitrates and phosphates are usually byproducts of fish life activity, and additional nitrate supplementation is rarely needed. Potassium is usually lacking in water and must be present since it is absorbed by the leaves. Potassium can be added in larger amounts because it does not cause algae growth.
Plant fertilizers by Tropical.
Tropical Aqua Plant. This is a liquid special fertilizer containing a full range of essential mineral salts, as well as nitrogen and phosphorus. Designed for systematic 
supplementation of aquarium plants in an optimally lit aquarium with a small number of small decorative fish. With regular use, the preparation guarantees intensive and vigorous growth, as well as the proper development of aquarium plants. Additionally enriches the water with carbon dioxide. Dosage: 1 ml per 10 liters of aquarium water.
Tropical Aqua Plant POND. This is a specialized multicomponent mineral preparation with rare earth elements for fertilizing aquatic and bog plants cultivated in a garden pond. Regular use of the preparation stimulates healthy and vigorous growth of all aquatic plants. It is especially recommended for use during the period of intensive plant growth. The fertilizer also has a positive effect on the pond ecosystem and is completely harmless to pond inhabitants: fish, crayfish, snails, amphibians, as well as birds and animals. A 250 ml bottle of the preparation is sufficient for 5,000 liters of water.
Tropical Aqua Plant B. This is a multicomponent mineral liquid fertilizer without nitrogen and phosphorus, containing a full range of essential mineral salts for growing aquatic plants in an aquarium with a large population of fish regularly fed with granular or flake food. In such aquariums, two elements (nitrogen and phosphorus) are already present in the form of organic compounds from the biological decomposition of fish waste. The fertilizer reduces the likelihood of algae, which can actively develop at elevated concentrations of nitrogen and phosphorus. With regular use, the preparation guarantees intensive and vigorous growth, as well as the proper development of aquarium plants. A 30 ml bottle of the preparation is sufficient for 300 liters of water.
Tropical Aquaflorin Potassium. A multicomponent mineral supplement with potassium intended for aquatic plants. Indispensable in situations of potassium deficiency in the aquarium, 
as well as in the first months of its operation, when the use of other macronutrients is not recommended. It does not contain nitrogen or phosphorus, so it can be used in densely stocked fish aquariums where these elements are released in excess from waste and leftover food. The composition of the supplement selected in this way reduces the risk of algae blooms while providing plants with the necessary nutritional components, promoting their proper growth and beautiful appearance. It allows potassium supplementation of plants without increasing the concentration of nitrogen and phosphorus, which is especially important in planted aquariums. Dosage: 1 ml per 10 liters of aquarium water.
Tropical Ferro-Aktiv. This is a special iron-enriched fertilizer for the systematic feeding of aquatic plants grown in an aquarium. Contains biologically assimilable iron. Prevents and eliminates iron deficiency, which can lead to a disease known as chlorosis, where leaves become pale and yellow. The fertilizer aids photosynthesis and chlorophyll production in cells. With correct dosing, it guarantees bright, intensely green leaves of aquatic aquarium plants. Dosage: 1 ml per 10 liters of aquarium water.
Tropical Kobaltosan. This is a biostimulant that saturates the aquarium water with active, easily assimilated cobalt ions. The preparation has a positive effect on the health of fish and aquatic 
plants. It immediately enhances growth and enriches coloration: after 14 days of use, colors become brighter and more contrasty, and red color saturates especially quickly. Stimulates the growth, health, and coloration of aquatic plants with red leaves. This effect has been confirmed by many years of experiments. Necessary during the breeding period of livebearing fish. Dosage: 1 ml per 10 liters of aquarium water.
Plant fertilizers by Aqua Medic.
Aqua Medic ferreal + spureal. Concentrated iron-containing plant fertilizer. It is a combined preparation containing, in addition to iron, plant-essential substances such as manganese, molybdenum, boron, zinc, and cobalt. When used correctly, it prevents plant degradation and yellowing of leaves. Colors become glossy and glowing.
Aqua Medic ferrapur. Concentrated substrate fertilizer. The new paste preparation Ferrapur includes a concentrated iron-containing fertilizer, micronutrients, and manganese. Using the included nozzle, the paste can be applied directly into the substrate, where it is absorbed by the plant roots. It fertilizes the plants, not the aquarium water, and serves as material for their growth.
Aqua Medic floreal + iod. Recommended as a supplement to Ferreal + spureal. It balances the substances necessary for plant health in the aquarium by supplying them with iodine and fluorine. The result is excellent flora growth in the aquarium. In addition to iodine and fluorine, it contains minerals such as potassium, magnesium, iron, and organic compounds.
Aqua Medic radix. A preparation to improve plant establishment. A combined preparation that significantly facilitates planting new plants in the aquarium. When transplanting, tablet A is first added to the plant roots to accelerate root system formation. A week later, after root formation has begun, tablet B should be added to accelerate leaf formation. Supplied in a package: 15 radix A tablets for accelerating root growth; 15 radix B tablets for accelerating leaf formation.
Aqua Medic terrapur. Fertilizer cones for freshwater aquariums. A concentrate intended for targeted fertilization of aquatic plants. Due to the high concentration of nutrients, the effect of the preparation is noticeable within a few days. At the same time, it does not cloud the water and does not disintegrate after the nutrients are washed out. The fertilizer contains, besides iron and manganese, other micronutrients, as well as potassium and magnesium. All of them are bound in the structure of natural bentonite.
