Seachem Flourish Phosphorus 500ml - Phosphorus Supplement for Planted Aquariums

Overview for planted aquariums

Seachem Flourish Phosphorus 500ml delivers a precise boost of phosphorus to support the growth and health of aquatic plants in a dedicated planted aquarium. The formulation is a safe 4500 mg/L solution of potassium phosphate, designed to be dosed with consistency so you can maintain phosphorus levels without guesswork. This product is intended to be used as part of a broader plant nutrition routine and can help you respond to growth cues as your aquarium matures.

What makes it useful

In planted tanks, phosphorus plays a key role in energy transfer and new tissue formation. This product provides a steady supply that can help plants develop strong leaves, encourage root activity, and sustain vibrant coloration. By providing a clear, consistent phosphorus source, it can help you keep pace with plant needs without disturbing other nutrients.

• Reliable phosphorus boost to support healthy, lush foliage in planted aquariums
• Safe, concentrated 4500 mg/L potassium phosphate solution for controllable dosing
• Designed to reduce dosing guesswork and streamline routine maintenance

Practical usage and dosing tips

• Begin with small, measured additions and observe plant response over 1–2 weeks
• Regularly test aquarium nutrients and adjust dosing to align with plant density and light levels
• Integrate with other macro/micro fertilizer products to maintain a balanced nutrient profile

Who should consider it

If you keep a densely planted freshwater aquarium and want a straightforward way to support phosphorus availability, Flourish Phosphorus can fit into a routine alongside substrates, CO2, and lighting planning. It is not a replacement for a full fertilization program, but rather a component you can add as growth demands change.

Easy to incorporate into your routine

With its clear dosing target and safe concentration, this supplement can become a predictable part of your weekly maintenance. As your plants respond to improved phosphorus availability, you may notice more consistent growth patterns and healthier-looking leaves, especially in fast-growing species.