Seachem Flourish Nitrogen

• Dual nitrogen source – roughly half nitrate, half complexed ammonium, giving plants both forms without releasing free ammonia into the water.
• Shrimp and invertebrate safe – no free ammonia is released at label doses.
• Corrects nitrogen deficiency – for stunted growth and pale colour in demanding, fast-growing planted tanks.
• Pairs with the rest of the NPK line – designed to be dosed alongside Flourish Phosphorus and Flourish Potassium for full macronutrient control.
• Five bottle sizes – 100 mL through to 4 L.

Derived from: Potassium Nitrate, Urea.

Every size works out to under 1c per litre treated at the beginner dose rate – the 4 L bottle is the cheapest per litre of the five, the 100 mL bottle the most expensive, and even the smallest bottle still costs a fraction of a cent per treated litre. A 100 L tank dosed twice weekly at the beginner rate uses roughly 1.6 mL a dose, so a 250 mL bottle covers around six months before a refill.

• Beginner dose: 2.5 mL per 160 L, twice a week, or as needed in response to nitrogen deficiency signs (pale new growth, stalled stem growth).
• Expert dosing formula: 0.25 × v × n = m, where v is tank volume in gallons, n is the desired nitrogen increase in mg/L, and m is the millilitres to dose. For a nitrate-equivalent calculation, use 0.05 in place of 0.25.
• Test nitrate with a liquid or strip test kit before dosing if you're unsure of your current level – Flourish Nitrogen adds to whatever nitrate your tank is already carrying from fish waste.

• Suitable for freshwater planted tanks with fast-growing or nitrogen-hungry stem plants.
• Not needed in most lightly stocked, lightly planted tanks – fish waste alone often supplies enough nitrate, and adding more without plant demand just feeds algae.
• Safe for shrimp and other invertebrates at label doses – no free ammonia is released.

• Seachem Flourish – base trace elements, low in nitrogen and phosphate by design so this product can fill the gap.
• Seachem Flourish Iron – targeted iron dosing for red and deficient plants.
• Seachem Flourish Excel – liquid carbon dosed on its own daily schedule.

Seachem doesn't publish a fixed warranty term on consumable dosing products; your purchase is still covered by the consumer guarantees under Australian Consumer Law. Ships as a standard parcel – no cold chain or special handling required.

Will Flourish Nitrogen cause an ammonia spike?

No. Seachem states no free ammonia is released at label doses – the ammonium component is complexed and only becomes plant-available as it's metabolised.

Do I need this if I already have fish in the tank?

Not always. Fish waste already supplies nitrate, and a heavily stocked tank may need little or no extra nitrogen. Flourish Nitrogen is aimed at fast-growing, densely planted tanks where plant demand outpaces what fish waste alone provides – test before dosing if you're unsure.

Is it safe for shrimp?

Yes, Seachem states it's safe for invertebrates including shrimp at label dosing.

What else do I need to dose alongside it?

Flourish Nitrogen covers nitrogen only. For full NPK coverage, Seachem pairs it with Flourish Phosphorus and Flourish Potassium, plus a base trace-element product like Flourish.