Seachem Flourish Potassium 250mL

Seachem Flourish Potassium 250mL is a highly concentrated potassium supplement designed specifically for planted aquariums. Potassium is one of the most critical macronutrients for aquatic plants — and one of the most commonly deficient nutrients in closed aquarium systems.

Unlike nitrogen and phosphorus, potassium does not accumulate from fish waste in meaningful amounts. That means many planted tanks — especially those with heavy plant mass, strong lighting, or CO₂ injection — quietly become potassium deficient over time.

What Does It Do?

✔ Supports strong stem and leaf development
✔ Promotes vibrant, rich green coloration
✔ Helps prevent leaf pinholes and yellowing
✔ Improves overall plant resilience and growth rate

Common Issues This Helps Prevent or Fix:

• Small holes forming in older leaves

• Yellowing leaf edges

• Weak stems or brittle growth

• Stunted plant development

• Transparent leaf patches

If you’re seeing pinholes in Java Fern, yellowing in stem plants, or general slow growth despite dosing other nutrients — potassium deficiency is often the culprit.

How Do You Know You Need It?

You likely need Flourish Potassium if:

• You run a planted tank but don’t dose potassium specifically

• You’re using RO water or very soft water

• You’re seeing leaf damage that isn’t iron-related

• Your plants grow, but lack strength and fullness

• You run high light or injected CO₂

In most aquariums, potassium supplementation is not optional — it’s foundational.

Dosage Instructions:

• Standard Dose: 5mL per 125 litres, 1–2 times per week

• For heavily planted or high-tech tanks, dosing may be increased as needed based on plant response

• Can be used alongside comprehensive fertilisers such as Seachem Flourish

Always monitor plant health and adjust gradually.

Why Choose Seachem Flourish Potassium?

✔ Highly concentrated formula
✔ Does not impact nitrogen or phosphate levels
✔ Safe for freshwater planted aquariums
✔ Ideal for low-tech and high-tech aquascapes
✔ Easy liquid dosing

If you’re serious about plant growth and long-term aquascape health, Seachem Flourish Potassium 250mL is a key part of a balanced fertilisation routine.