Consider carefully whether you genuinely need to introduce additional nitrates into your aquarium via artificial fertilizers. Subpar plant health is frequently caused not by a shortage of nitrogen and other macronutrients, but rather by a deficit of trace elements (such as iron, manganese, and boron) vital for their metabolic processes. If your plants look lackluster despite detectable nitrates in the water column, the issue likely has little to do with overall nutrient scarcity.
Always inspect the ingredient list carefully. The formula should be free of phosphates and nitrates (commonly designated by the N-P-K ratio, where N stands for nitrogen, P for phosphorus, and K for potassium). Fish metabolic waste typically generates sufficient nitrates and phosphates, making extra dosing rarely necessary. Potassium, however, is frequently deficient in aquarium water and must be supplied, as it is readily absorbed through foliage. You can dose potassium more liberally since it does not trigger algae blooms.
Tetra Plant Fertilizers
Tetra Plant Crypto. Root-feeding tablets designed for lush, healthy aquatic plants that absorb nutrients primarily through their roots. Perfect for robust root development and enriching the substrate. 
This product contains iron and essential trace elements in a readily bioavailable form tailored to substrate-specific needs, thereby supporting beneficial benthic microflora. Featuring an elevated iron content, it rapidly corrects deficiencies and works exceptionally well for Cryptocoryne species and other iron-dependent hydrophytes like Vallisneria and Barclaya.
Nutrients remain accessible to plants over an extended period. Free from nitrates and phosphates, it prevents water pollution and discourages algae growth while supporting beneficial substrate microorganisms. Dosage: 1 tablet per 20 liters of water, pushed directly into the substrate near the root zones. The tablet format allows targeted placement precisely where plants need it most.
Tetra Plant Flora Pride Red. A liquid fertilizer formulated specifically for red aquarium plants, packed with the iron required for vibrant growth. Specialized components like potassium and manganese strengthen stems and foliage, promoting rapid and healthy development. The formula disperses evenly throughout the water column, penetrating foliage directly to provide long-lasting nourishment. It stimulates chlorophyll production for rich, saturated coloration while preventing algae proliferation. Free of nitrates and phosphates, it leaves the water chemistry uncompromised. Dosage: 10 ml per 20 liters of water during each water change. Shake well before use.
Tetra Plant Initial Sticks. Comprehensive iron-rich fertilizer sticks that compensate for nutrient deficiencies in new setups or when renewing aquarium substrates. 
Based on granulated humus—a natural source of organic compounds essential for aquatic flora—these sticks create a long-term nutrient reservoir for root systems. Plants root quickly and naturally outcompete algae, which is crucial when establishing a new tank. This slow-release fertilizer boosts overall growth without introducing elements harmful to fish.
Nitrate- and phosphate-free, it keeps the water clean. Environmentally safe and designed for freshwater systems, it fosters a healthy micro-environment in the substrate. Application: mix the sticks into the substrate (at a rate of 1 g per liter of aquarium water) when starting a new tank, or push them into the substrate of an established aquarium for targeted supplementary feeding.
Tetra Plant Planta Min. A liquid fertilizer enriched with iodine and B vitamins for aquatic plants, engineered to promote deep green, lush foliage. Nutrients are absorbed directly through the leaves. It contains iron, manganese, potassium, and a full spectrum of trace elements necessary for leaf development. It aids chlorophyll synthesis and ensures a steady, prolonged supply of micronutrients while fostering strong, healthy root systems. Nitrate- and phosphate-free, it avoids placing any biological load on the aquarium ecosystem, helping to deter unwanted algae. Dosage: 5 ml per 10 liters of aquarium water. After four weeks, reduce the dose by half.
Tetra Plant Planta Start. A comprehensive tablet fertilizer containing vital macro- and micronutrients for proper initial development. 
It supplies newly introduced plants with essential nutrients directly at the roots. Acting as a growth catalyst, it protects and strengthens the root system, helping specimens recover rapidly from transplant shock. Alongside a wide array of minerals, it features a root-formation stimulator that accelerates adaptation in newly planted flora.
It improves survival rates for relocated specimens, while plant hormones encourage vigorous rooting and boost hardiness through essential macronutrients. Dosage: 1 tablet per 50 liters of aquarium water, placed in the substrate close to the root zone.
ZMF Dynoplant. Root-feeding fertilizer tablets designed to supply nutrients directly through the root system.
Sera Plant Fertilizers
The Sera fertilization system—consisting of Sera florena, Sera florenette A, Sera floreplus, and Sera flore daydrops—offers a complete regimen for all aquatic plants, whether they feed primarily through leaves, roots, or a combination of both. Sera florena is absorbed via foliage and encourages lush, vibrant green growth. For root-feeders, Sera florenette A tablets release nutrients gradually to ensure robust development. Both Sera florena and Sera florenette A supply essential minerals like potassium and iron, along with trace elements such as manganese.
Sera flore plus delivers key macronutrients like calcium and magnesium while accelerating growth using natural stimulants. Due to oxygen exposure, lighting, and filtration, certain sensitive nutrients can degrade and become unavailable to plants over time. Sera flore daydrops prevents these shortages by supplying essential trace elements in precise proportions. These products complement one another to guarantee lush greenery and vigorous growth. All Sera plant fertilizers are entirely free of nitrates and phosphates.
Application guidelines: Add 5 ml of Sera florena and/or 1 tablet of Sera florenette A per 20 liters of water once a week, burying the tablets near the roots. Additionally, press 1 tablet of Sera floreplus into the substrate (1–2 cm deep) per 20 liters of water every two weeks (on the same day you dose Sera florenette A). Apply one drop of Sera flore daydrops per 10 liters of water daily.
Sera flore daydrops. A balanced micro- and macronutrient supplement that forms the foundation for lush aquatic greenery. 
Oxygen, lighting, and filtration can break down delicate nutrients quickly, leaving them unavailable to plants in adequate amounts. Daily dosing supplies 16 vital nutrients in a balanced, targeted manner. For optimal plant health, all necessary elements must be available in sufficient quantities; growth stalls if even a single component is missing, leaving surplus nutrients behind for nuisance algae to exploit. Dosage: one drop per 10 liters daily.
Sera flore plus. A macronutrient tablet fertilizer and growth booster that promotes rapid development, rich green coloration, and robust, healthy structures. 
It not only accelerates growth but also optimizes the effectiveness of other Sera fertilizers. A well-balanced blend of natural growth enhancers guarantees fast development, dense foliage, strong roots, and high disease resistance. Free of nitrates and phosphates, it allows aquarists to fully satisfy their plants’ nutritional needs without risking unwanted algae outbreaks. Application: press one tablet into the substrate per 20 liters of water every 2 weeks.
Sera florena. A sophisticated liquid fertilizer containing minerals, trace elements, and iron tailored for all types of aquatic plants. Its active ingredients are readily absorbed through the leaves and remain stable in the water column until utilized by the foliage. It encourages healthy, dense growth without introducing nitrates or phosphates, preventing any algae-promoting side effects.
Sera florenette A. A comprehensive mineral and iron tablet designed specifically for root-feeding aquatic plants. It acts as a nutrient depot, dissolving slowly to release bioavailable compounds directly to the root systems while strengthening them. One tablet is sufficient for approximately 20 liters of water and should be placed near the roots.
