Brightwell Aquatics

Florin-Fe - Iron Supplement for Planted Aquariums

Grouped product items
Florin-Fe (250 mL)

SKU: 252514

In stock


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Florin-Fe (500 mL)

SKU: 252515

In stock


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Bioavailable Ferrous & Ferric Iron Source for Planted Tanks

  • Concentrated source of both ferrous (Fe2+) & ferric (Fe3+) iron
  • Provides both immediate and slow releasing iron
  • Aids in chlorophyll production & plant metabolic reactions
  • Helps to prevent yellow or transparent leaves
  • Over 50% stronger than competitor products
  • Formulated using extensive research on aquatic plant nutrient requirements 

Iron is a crucial element for plants, both in water and on land. It helps produce chlorophyll and activates enzymes involved in important metabolic reactions. It is considered a micronutrient that can limit plant growth in certain aquatic environments. Adding iron to these systems can boost plant growth, but too much iron can lead to excessive algae growth, especially when there are high levels of nitrate and phosphate. Iron deficiency is visible when plant leaves turn yellow or translucent and eventually disintegrate. Brightwell Aquatics Florin-Fe provides iron in two stages-- immediate and delayed-- ensuring a stable concentration that can be gradually absorbed by aquarium plants. It's recommended to add iron daily instead of weekly to maintain stability and avoid sudden increases that can promote algae growth. Daily dosing allows for better observation of changes in the aquarium and adjustment of iron dosage as needed.


Instructions & Guidelines

Shake product well before using. The most effective method of using any ion-specific supplement is to determine the ionic concentration in the aquarium prior to supplementing.

Basic: Add 5 ml (1 capful) of product per 50 US-gallons (187.3 L) of aquarium water every other day or as required; this corresponds to 1 ml (~8 drops) per 10 US-gallons (37.9 L). When used in this fashion, 250 ml treats up to 2,500 US-gallons (9,463.5 L). Maintain the iron concentration within a range of 0.05 - 0.10 ppm.

Advanced: Determine the iron concentration in the aquarium using an accurate test kit before supplementing. Each ml of Florin-Fe will increase the concentration of total iron (“[Fe2+/3+]”) in 1 US-gallon (3.785 L) of water by 3.2 ppm. Each drop (250- and 500-ml cap) will increase the [Fe2+/3+] in 1 US-gallon (3.785 L) of water by 0.4 ppm, and the [Fe2+/3+] in 20 US-gallons (75.7 L) by 0.02 ppm. Maintain the iron concentration within a range of 0.05 - 0.10 ppm.

Note: It is advisable to ensure that the concentration of phosphate not exceed 0.05 ppm in the aquarium to be dosed with an iron supplement. If the initial [Fe2+/3+] in the aquarium is below 0.05 ppm, add this product at the maximum rate of 1 ml per 10 US-gallons daily until the desired concentration is attained, then dose daily or weekly as needed (see below). Always attempt to maintain the [Fe2+/3+] within a range of +/-0.02 ppm. To determine the dosing rate of this product once the desired [Fe2+/3+] has been acquired, measure the daily rate of iron uptake (i.e. the decrease in iron) in your aquarium by measuring the aquarium's [Fe2+/3+] at the same time each day over a one- to two-week period. To determine the daily dosing rate (preferable to weekly dosing) for iron maintenance: estimate the volume of water in the entire aquarium system; divide the daily decrease in [Fe2+/3+] by 3.2; multiply this number by the volume of water in the system to get the daily dosage required (ml) to maintain a stable [Fe2+/3+]. Daily dosing maintains a more stable [Fe2+/3+] (and more natural environment) than dosing weekly, in which the [Fe2+/3+] spikes just after dosing and then gradually decreases throughout the course of the week.


Caution: Keep out of reach of children. Not for human consumption.


Guaranteed Analysis (minimum): Iron (Fe) (min) 1.20% (355 mg/oz.; 12,000 ppm)


Ingredients: Ferrous gluconate, Iron EDTA, purified water

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