Seachem Flourish Iron 100ml Plant Fertiliser

Seachem Flourish Iron 100ml supplies additional iron for aquarium plants when their needs exceed the iron provided by Flourish at its recommended dose, or when signs of iron deficiency appear. It is a targeted iron supplement, not a complete all-in-one plant fertiliser.

When to use Flourish Iron

Seachem identifies yellowing of tissue between leaf veins and short, slender stems as possible signs of iron deficiency, usually seen in new growth. Use iron testing alongside plant observations to guide supplementation.

Concentrated ferrous iron

Flourish Iron contains 10,000mg/L of ferrous iron (Fe2+) as ferrous gluconate, equivalent to 1.0% iron. It contains no phosphate or nitrate.

The iron is already in the ferrous form, so plants do not need to expend energy reducing ferric iron to ferrous iron before use. Seachem describes the relatively weaker iron-gluconate bond compared with iron-EDTA as well suited to foliar feeding; gluconate also provides a source of carbon.

• Use one capful (5mL) per 200 litres, or as required to maintain approximately 0.10mg/L iron.
• For smaller doses, each cap thread measures approximately 1mL.
• Monitor iron concentrations using an appropriate test kit. Seachem recommends MultiTest Iron.
• Because iron is used rapidly, Seachem advises testing within 30 minutes of dosing.
• Dose according to iron demand rather than assuming a fixed schedule suits every planted aquarium.

Seachem notes that the standard 5mL per 200-litre dose raises iron by approximately 0.25mg/L to accommodate rapid utilisation. This dose increase is different from the approximately 0.10mg/L level it recommends maintaining.

• Iron (Fe): 1.0%

Derived from ferrous gluconate.