Seachem Flourish Nitrogen Planted Reef Tank Refugium

    Seachem Flourish Nitrogen


    Seachem Flourish Nitrogen is a highly concentrated source of nitrogen designed for the use in planted aquariums. It is one of the three main macronutrients macroalgae / plants will need to grow ( nitrogen (nitrate), phosphorus (phosphate), potassium ).
    It is recommended to add when the plants/macroalgae growth is reduced, especially in a more heavier planted reef tank / macroalgae refugium.



    Seachem Flourish® Nitrogen Supplement for the Planted Reef Tank & Refugium 100ml / 250ml / 500ml


    • Liquid nitrogen supplement for planted aquariums
    • Provides marine and freshwater aquarium plants / macroalgae the macronutrient nitrogen
    • Essential nutrient for aquarium plants / macroalgae showing nitrogen deficiency

    Seachem Flourish Nitrogen supplies one of the three main macronutrients macroalgae / plants need to grow (nitrogen, phosphorus, potassium) and can often become the limiting factor to growth in more heavily planted aquariums .

    250 ml treats up to 18.900 L.

    For maximum benefit use together with Flourish Phosphorus and Flourish Potassium.  

    Beginner: Use 2.5 mL (half a cap) for each 160 L  twice a week or as needed in response to signs of nitrogen deficiency (e.g., stunted growth). For smaller doses, please note that each cap thread is approximately 1 mL.

    Expert: The beginner dose raises nitrogen by the same degree that 1 mg/L nitrate would. This dose is sufficient to provide approximately 4 g of growth (dry) or about 20 g (hydrated) over a 1 month period (assuming all other necessary nutrients are provided). For increased growth, use proportionately more. To target a specific nitrogen increase, dose according to the following formula: 0.25vn=m, where v= volume of tank in gallons*, n=desired nitrogen increase (if using a "nitrate equivalent" value for "n" then use a factor of 0.05 instead of 0.25 in the formula) and m=volume of product to use in mL. For example, to raise 20 gallons* by 0.20 mg/L nitrogen, you would use: 0.25*20*0.20=1 mL.

    Because one-half of the nitrogen in Flourish Nitrogen™ is from nitrate you can get a reasonable estimate of nitrogen levels by doubling a nitrate reading.

    Guaranteed Analysis
    Total Nitrogen (N)*1.5%, Soluble Potassium (K2O)2%, *1.5% Soluble Nitrogen



    We want you to be fully happy with your new macroalgae addition. Therefore we offer you a hassle free Satisfaction Guarantee.  

    If you are not 100%  happy with the macroalgae you have received on arrival we will refund you the full money back.    *1
    We even will cover the return costs. The refund will be offered after we arrived and checked the returned marine algae.

    *1 = Valid for UK Orders only, please see our Terms for EU orders HERE 


    We offer for sale macroalgae from our mature macroalgae mother colonies in a premium quality & 100% healthy within the UK and EU.
    All live algae species are sustainably grown in the UK.

    All macroalgae will be well protected when posted to you to ensure that it will arrive in the best condition at yours.


    We won't be beaten on the premium quality of our live algae cultures, and surely not on the price either!

    Have you seen the same macroalgae somewhere else cheaper?

    Please just send us a message HERE and we will check your request within 24 hours ( working days only ).

    When we can match the other price we will send you a discounted offer which will be valid for the next 7 days after receiving our email.
    This offer will be just valid for purchases using the same email address provided before.

    The price match offer is only valid for identical, same size/amount and available macroalgae species.
    As a proud UK based tax paying business, we don't price match any offers against auction sites or from private sellers.

    The price match offer is just valid for UK deliveries. We reserve the right to refuse a price match request.

    If you have any questions please don't hesitate to contact us.

    Your Livealgae UK

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