Seachem Flourish Potassium 2L (SC-468)


New product

  • Prevents yellowing of leaves
  • Helps plants to maintain rigorous growth
  • Ensures plant stems are firm and sustains a longer growth
  • Triggers plants to grow, but not algae

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$ 78.50

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Brand: Seachem

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Seachem Flourish Potassium 2L

Seachem Flourish Potassium is a liquid supplement that boosts the growth of aquatic plants, results in thriving green leaves, stronger firmer stems, and it does all these without triggering algae growth.

Potassium helps to maintain vigorous growth of plants in planted tanks. The fact is Potassium depletes quickly in a tank with growing plants, or when the source water has a low mineral content.

In these cases, potassium could become the limiting factor to growth. With Seachem Flourish Potassium, you can easily supplement the potassium content in aquarium system, to prevent problems such as yellowing in older leaves, and ensure that your plants maintain their rigorous growth.

Flourish Potassium contains 50,000 mg/L of potassium, and is suitable for the natural planted aquarium.

Benefits of Seachem Flourish Potassium

  • Prevents yellowing of leaves
  • Helps plants to maintain rigorous growth
  • Ensures plant stems are firm and sustains a longer growth
  • Triggers plants to grow, but not algae

Potassium Dosing - What to Avoid

The most easily obtained sources of potassium are potassium nitrate and potassium phosphate. Both of these sources add to either nitrogen or phosphorus as well as potassium, making it virtually impossible to target a specific NPK ratio.

Seachem Flourish Potassium is derived from potassium sulfate, allowing the user to adjust potassium levels without affecting nitrogen or phosphorus.

Furthermore, Seachem Flourish Potassium will not trigger algae grow. It would only cause aquatic plants to flourish.

Benefits of Seachem Flourish Potassium

  • Safe concentration (4,500 mg/L phosphate)
  • Nitrate free
  • Safe for invertebrates such as shrimp
  • Enhances and accelerates the growth of aquatic plants
  • Does not trigger algae growth


Use 1 capful (5 mL) for every 125 L (30 US gallons). This dose raises potassium by 2 mg/L. Repeat 2–3 times per week or as needed in response to signs of potassium deficiency in older leaves which include: chlorosis (yellowing), necrosis (death/browning), pinholes in leaves, and weak stems and roots.


Amounts per 1 g: Soluble Potash (K2O) 5%

Derived from: Potassium sulfate

Elemental potassium is present at a concentration of 50,000 ppm (e.g 5%). Fertilizer laws require us to list potassium in terms of equivalence to a material that is not present (K2O) rather than the more scientifically sound method of simple elemental equivalence.

Seachem Plant Supplements Online Shop

N30 is the authorised dealer in Singapore for Seachem plant supplements.

Order your Seachem plant supplements online today at

Seachem Guide

Which Seachem products do I need?

From treating fish infections to solving water and algae problems, Seachem has the right products to restore your aquarium.

Seachem - Fish Disease Treatment

A sick fish can spread infection quickly within an aquarium and threaten the life of other aquatic inhabitants. It is critical to accurately diagnose fish disease and dose the right medications as early as possible.

common fish diseases symptom guide - seachem medication guide

Seachem - Solve Aquarium Problems

Sometimes, a small change in water chemistry, alkalinity and acidity could cause problem for the aquarium. Below are some of the common problems:

  • Cloudy water
  • Algae over growing
  • Ammonia, nitrite, nitrate toxicity
  • Detritus or slime

Is your aquarium facing any of the above issues? If yes, use this guide to find the right Seachem products to restore your aquarium.

seachem products for common aquarium problems

About Expiration of Seachem Products

Many Seachem products do not have an expiration date by virtue of the ingredients used to make the products. Many mineral and non-organic components are shelf-stable, and do not have a finite shelf-life, and may be used for years with continued efficacy. If a product does not have a printed date of expiration, it can safely be assumed that the product does not expire.

expiration date of seachem products

About N30

About N30 Tank

N30 Tank Pte. Ltd. is a leading manufacturer of custom-made fish tanks cabinets. As a tank maker, we supply aquarium cabinets to homes and offices locally as well as ship orders worldwide.

N30 provides expertise in the construction of large acrylic aquariums, such as those in Underwater World (Resort World Sentosa). We supply customised storage tanks to fish farms such as Qian Hu, and to major restaurants. The N30 brand name is trusted for quality workmanship in the industry.

N30 has developed unique glass-sealing techniques, which allows us to produce very large tanks (such as 30-feet long) without issue of water leakage. For all custom-made fish tanks, N30 assures customers of Five Years Warranty against water leakage.

To support the needs of aquarium hobbyists, N30 is also offering a wide range of aquarium accessories such as filters, pumps, lighting, wave makers, skimmers... for sale online. We encourage customers to browse and shop online at for accessories. It is convenient and we provide free delivery for orders (see the online store terms and conditions for details).

Loyalty Points

Loyalty Points (N30 Member Rewards)

Earn 5 points per dollar

N30 members earn five points per dollar spent online at Each point is worth S$0.01 in cash value.

Convert points into eVouchers redeemable for discounts on your orders.

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When you purchase S$100 of aquarium accessories online at, you will earn 500 points in your N30 account. You may convert the 500 points into an eVoucher worth S$5. To use this eVoucher on your next order, simply enter the unique eVoucher code in your shopping cart before you check out. That's all!

The more you shop on, the more you will save on your next order!

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