Seachem Flourish Phosphorus Plant Supplement – 500mL
Seachem Flourish Phosphorus is a concentrated phosphorus supplement for freshwater planted aquariums. Phosphorus is one of the three major macronutrients aquatic plants need for healthy growth, along with nitrogen and potassium.
Flourish Phosphorus provides phosphate from potassium phosphate and is nitrate free, allowing planted aquarium hobbyists to dose phosphate separately based on plant demand without also increasing nitrate.
Key Features
- Phosphorus supplement for freshwater planted aquariums
- Provides phosphate from potassium phosphate
- Nitrate free for separate phosphate dosing
- Helps support healthy aquatic plant growth
- Useful for planted tanks with low phosphate levels
- Can help address phosphorus deficiency signs such as stunted growth or very dark green plants
- Pairs well with Seachem Flourish Nitrogen and Flourish Potassium
- 500mL bottle is great for routine dosing or larger planted aquariums
Recommended Use
- Freshwater planted aquariums
- Low-phosphate planted tanks
- High-light aquascapes
- CO₂-injected planted tanks
- Heavily planted aquariums
- Aquariums showing signs of phosphorus deficiency
- Planted tanks where phosphate is quickly depleted
Directions
Shake well before use. Test phosphate levels regularly and dose according to plant demand.
- Beginner Dose: Use 2.5mL for each 20 US gallons once or twice a week, or as needed.
- Beginner Dose Increase: This dose raises phosphorus by approximately 0.05 mg/L, equal to about 0.15 mg/L phosphate.
- Target Range: Ideal phosphate varies by aquarium, but generally ranges from 0.15–1.0 mg/L.
- Small Tank Dose: Each cap thread is approximately 1mL.
- Pair With: Seachem Flourish Nitrogen and Flourish Potassium for balanced planted aquarium macronutrient support.
Product Specifications
- Brand: Seachem
- Product: Flourish Phosphorus
- Size: 500mL / 17 fl oz
- UPC: 000116019309
- Water Type: Freshwater
- Use: Phosphorus / phosphate supplement for freshwater planted aquariums
Frequently Asked Questions
What does Seachem Flourish Phosphorus do?
Flourish Phosphorus provides phosphate to freshwater aquarium plants, helping support healthy growth and preventing phosphorus from becoming a limiting nutrient.
When should I use Flourish Phosphorus?
Use Flourish Phosphorus when phosphate levels are low or when plants show signs of phosphorus deficiency, such as stunted growth or very dark green coloration.
Is Flourish Phosphorus the same as Seachem Flourish?
No. Seachem Flourish is a comprehensive trace supplement, while Flourish Phosphorus is a targeted macronutrient supplement for phosphate support.
Does Flourish Phosphorus contain nitrate?
No. Flourish Phosphorus is nitrate free, allowing phosphate to be dosed without also increasing nitrate.
How often should I dose Flourish Phosphorus?
The beginner dose is 2.5mL per 20 gallons once or twice weekly, or as needed based on plant growth and phosphate testing.
What phosphate level should I aim for?
The ideal phosphate level varies by tank, but Seachem notes that it generally ranges from 0.15–1.0 mg/L.
Can Flourish Phosphorus cause algae?
Any nutrient supplement can contribute to algae if overdosed or if lighting, CO₂, and maintenance are out of balance. Dose based on plant demand and test water regularly.
Can I use Flourish Phosphorus with Flourish Nitrogen and Potassium?
Yes. It can be used with Flourish Nitrogen and Flourish Potassium when a planted aquarium needs balanced macronutrient support.
Is Flourish Phosphorus safe for shrimp?
Seachem states that Flourish Phosphorus is safe for invertebrates such as shrimp when used as directed.
Important Note
This product is intended for ornamental freshwater aquarium use only. Keep out of reach of children. Not for human consumption. Always follow label directions and test phosphate regularly when dosing phosphorus supplements.
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