For each 200L use up to 1 capful that is 5mL and as needed to stabilize about 0.10mg/L iron. For small doses, it is recommended to use approximately 1mL of cap thread.
Flourish Iron is a ferrous iron gluconate supplement with a high concentration (10,000 mg/L). Plants may benefit from Flourish Iron considerably more readily since ferrous iron gluconate is already in the ferrous state, so they don’t have to expend energy decreasing it.
High-concentration iron source for the planted aquarium
Ferrous gluconate iron
Foliar feeding is more adapted to ferrous gluconate than iron-EDTA.
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