Seachem Flourish Phosphorus 250ml

Unlike competing products that combine nitrate and phosphate in constant proportions, Flourish Phosphorus ™ (being nitrate-free) gives you the ability to dose phosphorus according to plant needs without the risk of nitrate overdose. When used as recommended, Flourish Phosphorus ™ will increase and accelerate the growth of aquarium plants without increasing algae growth.
Instructions for use:
Use 2.5 ml (half cap) for every 80 L, once or twice a week, or as needed when signs of phosphorus starvation appear (eg growth deprivation, darkening of plants).
The ideal phosphate level can vary, but is generally in the 0.15-1.0 mg / L range.
To achieve a specific increase in phosphate level, calculate dosage using the following formula: 0.8vp = m where v = vessel volume in gallons *, p = desired level of phosphate increase and m = product volume in ml.