Seachem Flourish Potassium
Seachem Flourish Potassium is a top-of-the-line potassium (50,000 mg/L) supplement designed specifically for use in delicate planted aquariums. Potassium is one of many vital macronutrients, alongside nitrogen, phosphorus and others, that are required by aquatic plants, with their absence becoming a limiting factor to healthy growth and development. In aquariums with low mineral content, potassium can be quickly depleted and cause unsightly yellowing in older leaves.
Within the aquarium setting, the most easily obtained sources of potassium are potassium nitrate and potassium phosphate, both of which increase the levels of nitrogen, phosphorus and potassium and eliminate the ability to target a specific NPK (nitrogen, phosphorus, potassium) ratio. Seachem Flourish Potassium provides precise potassium supplementation without affecting nitrogen or phosphorus levels.
| Specification | Value |
|---|---|
| Potassium Content | 50,000 mg/L |
| Form | Water-soluble powder |
| Recommended Use | Planted aquariums with low potassium levels |
| Application Rate | 1 ml per 100 liters of water (as per tank size and plant needs) |
FAQ
What is the recommended dosage for Seachem Flourish Potassium?
The recommended dosage is 1 ml per 100 liters of water, depending on the size of the tank and the specific plant needs.
Can Seachem Flourish Potassium be used in tanks with live fish?
Yes, it is safe for use in tanks with live fish as it is specifically formulated for planted aquariums and does not contain harmful substances.
Does this product affect nitrogen or phosphorus levels in the aquarium?
No, Seachem Flourish Potassium provides potassium without increasing nitrogen or phosphorus levels, allowing for precise NPK ratio control.

Felicity Manning –
I’ve been using Seachem Flourish Potassium for three months now and my aquarium plants have grown much healthier. The yellowing on older leaves stopped completely. It’s easy to mix and works well with my existing setup.
Diana Springer –
The potassium boost is noticeable in my stem plants. I didn’t have to adjust my other nutrients, which was a big relief. It’s a reliable supplement for maintaining plant health.
Julian Gill –
After switching from a general fertilizer, my anubias and java ferns have developed fuller leaves. The product is easy to use and has made a clear difference in plant color and growth.