Seachem Flourish Iron Planted Aquarium Fertilizer

    Seachem Flourish Iron


    Seachem Flourish Iron is a highly concentrated (10,000 mg/L) source of ferrous iron designed for use in planted aquariums.
    It is recommended to add when the macroalgae growth is reduced, especially in more heavier planted reef tanks / macroalgae refugiums.



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

    • Highly concentrated (10,000 mg/L) source of ferrous iron for aquarium plants in the saltwater & freshwater aquarium
    • Ferrous iron is an excellent source of beneficial carbon
    • Contains no phosphate or nitrate.
    • Use with Seachem Flourish to ensure a healthy macroalgae & freshwater plant growth

    Instruction Guidelines

    • Shake Seachem Flourish well before using.
    • Dosing recommendation: 
      Use 1 capful (5 ml) for each 200 L once a week or when necessary.  For smaller doses each cap thread is approximately 1 mL. 
    • Measure the Iron level in the aquarium regularly to maintain the recommended Iron concentration. 


    Keep out of reach of children. Not for human consumption. Handle with care in the aquarium.

    Iron (Fe) = 1% Derived from: Ferrous Gluconate

    Ferrous gluconate is not harmful to plants or fish and much better suited to macroalgae and aquarium plants than is iron-EDTA owing to the relatively weaker iron-gluconate bonding vs. iron-EDTA bonding. 



    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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