New Seachem Flourish Potassium Planted Reef Tank Refugium Fertiliser Expand

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.

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£ 6.95

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By buying this product you can collect up to 17 loyalty points. Your cart will total 17 points that can be converted into a voucher of £ 0.34.

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% 

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100% Satisfaction Guarantee

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

If you are not 100%  happy with the macroalgae you 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 algae.

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

Top Quality Macro Algae Guarantee

We offer you marine algae from our mature macro algae mother colonies in a premium quality & 100% healthy. Sustainably grown in the UK.

All macro algae we sell will be normally heat sealed and wet wrapped when posted to you, protected in a small box which assures that it doesn't get damaged while in transit. 

Best Price Guarantee

We won't be beaten on the Premium Quality of our Macroalgae cultures, and surely not on the price either!

Have you seen the same macro algae 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 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, please.

Your Livealgae UK

Livealgae UK

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