Seachem Flourish Potassium Planted Reef Tank Refugium Fertiliser

    Seachem Flourish Potassium


    Seachem Flourish Potassium is a highly concentrated (50,000 mg/L) source of potassium designed for the use in planted aquariums.
    It is recommended to add when the macroalgae growth is reduced, especially in a more heavier planted reef tank / macroalgae refugium.



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

    Potassium is one of several elements that are very important to maintaining a healthy growth of macroalgae and freshwater plants in a planted aquarium. Potassium can become depleted especially in a rapidly growing system / heavier planted macroalgae tank. 

    Seachem Flourish Potassium is derived from potassium sulfate without any Nitrate or Phosphate. 

    • Highly concentrated (50,000 mg/L) source of potassium for marine macroalgae & aquarium plants
    • For heavily planted tanks
    • Use with Seachem Flourish to ensure a healthy macroalgae & freshwater plant growth

    Instruction Guidelines

    • Shake Seachem Flourish Potassium well before using.
    • Dosing recommendation: 
      Use 1 capful (5 ml) for each 125 L two to three times a week or when necessary.  For smaller doses each cap thread is approximately 1 mL. This dose will raise Potassium by 2mg/l
    • Measure the Potassium level in the aquarium regularly to maintain the recommended concentration. 


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

    Analysis: Soluble Potassium (K2O) = 5.0% 



    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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