Seachem Flourish Phosphorus 250mL provides a concentrated source of phosphate (PO₄), one of the three primary macronutrients required for strong plant growth. In heavily planted, lightly stocked, or high-tech CO₂ aquariums, phosphate can quickly become depleted — restricting growth even when other nutrients are available.
Balanced phosphate levels are essential for energy transfer within plants, root development, and overall metabolic function.
What It Helps Fix
✔ Slow or stalled growth
✔ Dark, dull or patchy leaves
✔ Weak root development
✔ Plants failing to thrive in high light setups
✔ Imbalance between nitrate and phosphate levels
How You Know You Need It
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You dose nitrogen but plants still grow slowly
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Phosphate tests consistently read near zero
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You run strong lighting or injected CO₂
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Your tank is lightly stocked
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You see nutrient imbalance symptoms despite regular fertilising
Phosphate deficiency often shows as stalled growth rather than dramatic leaf damage — making it easy to overlook.
Dosage
Standard Dose: 2.5mL per 80L raises phosphate by approximately 0.05 mg/L
Dose 1–2 times per week or as needed based on phosphate testing and plant demand. Adjust gradually to maintain balance.
For maximum benefit, use alongside Flourish Nitrogen and Flourish Potassium to maintain balanced macronutrient ratios.
For stronger growth, improved plant mass, and balanced nutrient dosing, Seachem Flourish Phosphorus 250mL is a key component in any serious planted aquarium fertiliser program.
