Flourish Nitrogen 100ml

Flourish Nitrogen is a liquid nitrogen-only fertilizer for planted aquariums, aimed at keepers who see chlorosis or stunted growth and want to correct a nitrogen deficiency without adding phosphorus. The product is supplied in a 100 ml bottle and is dosed by water volume.

Why it matters

• Nitrogen is supplied as ammonium in bound form, which is released only inside plant cells, so no free ammonia is produced during use.
• Roughly half of the nitrogen is in nitrate form, which can be taken up by species able to use nitrates.
• The formula contains no phosphorus, so phosphate levels are not raised and the product can be used alone when only nitrogen is lacking.
• Half of the nitrogen is nitrate, so a nitrate test reading multiplied by 2 gives a reliable estimate of total nitrogen in the tank.

Specifications

• Volume: 100 ml
• Weight: 0.12 kg
• Total nitrogen: 1.5%
• Soluble potassium oxide (K2O): 2%
• Phosphorus: none
• Beginner dose: 2.5 ml (half cap) per 160 litres of water, twice a week or as needed when nitrogen deficiency symptoms appear
• Effect of beginner dose: raises nitrogen by the same amount as a nitrate solution of 1 mg/l

What it works with

The product fits planted tanks where nitrogen is the limiting nutrient, and the dose scales with water volume. For faster growth, the manufacturer's dosing formula (0.06 × V × n = m, where V is volume in litres, n is the planned nitrogen increase, and m is the product volume) allows higher doses in proportion to tank size.