Flourish Iron

  • Highly concentrated (10,000 mg/L)
  • Ferrous gluconate iron
  • Ferrous gluconate is better suited to foliar feeding than iron-EDTA

Description

Iron is immobile in plants. This means that plants cannot divert iron from older leaves to new ones. Therefore, deficiency symptoms appear first on new or young leaves. Because plants use iron to produce chlorophyll, a lack of iron results in chlorosis, or yellowing, of the younger leaves. Stems may also appear short and slender. If the deficiency is severe and prolonged, each new leaf emerges lighter in color than the preceding leaf.

When choosing an iron supplement, it is important to know the distinction between the two forms of iron. The iron will be in one of two oxidation states: ferrous having a +2 charge, or ferric having a +3 charge. Ferrous iron, the preferred iron form and is soluble in water at any pH. Ferric iron, however, is only soluble below a pH of around 5.5; but if the pH is higher than 5.5, which more than likely it will be in a planted aquarium, the ferric iron will become insoluble and precipitate, settling in the root zone. Once this occurs, foliar absorbtion becomes impossible.

To overcome this precipitation, competing products employ a chelate of ferric iron: iron-EDTA. While this does keep it soluble, it has a couple of drawbacks with respect to foliar uptake of iron. (1) Iron-EDTA bonding is very strong, thus very little of the iron will be available to the plants over a given time frame and (2) Physiological energy must be expended by the plant in order to extract the ferric iron from EDTA-iron and then convert (reduce) it to the ferrous form. Our approach is different in that we use a complex (not chelate) of ferrous iron in Flourish Iron™.

Flourish Iron™ is a highly concentrated (10,000 mg/L) ferrous iron gluconate supplement. Plants are able to much more easily derive a benefit from Flourish Iron™ because ferrous iron gluconate is already in the ferrous form so they do not expend energy reducing it. Despite what other manufacturers may intimate, gluconate is not harmful to plants or fish. In fact, ferrous gluconate is better suited to foliar feeding than is iron-EDTA owing to the relatively weaker iron-gluconate bonding vs. iron-EDTA bonding. In addition, ferrous gluconate has the added bonus of being a source of carbon.

Directions

Use 1 capful (5 mL) for each 200 L (50 gallons) or as required to maintain about 0.10 mg/L iron. For smaller doses please note that each cap thread is about 1 mL. Use MultiTest®: Iron test kit to monitor iron concentrations. Due to rapid utilization, test within 30 minutes. Use as needed to combat signs of iron deficiency (usually seen in new growth) which include: chlorosis (yellowing) of tissue between veins and short and slender stems.

Guaranteed Analysis

Iron (Fe) 1%

Derived from: Ferrous Gluconate

Sizes

50 mL, 100 mL, 250 mL, 500 mL, 2 L, 4 L


To reach your desired level use:

caps or mL


Considerations: We recommend maintaining an Fe level of about 0.10 mg/L. Iron is used quickly, so you will want to initially exceed 0.10 mg/L in order to prevent iron levels from falling below that level. For smaller doses, please note that each cap thread is about 1 mL

A: Iron is an important nutrient in the planted aquarium. In order to maintain an adequate iron concentration it should be dosed on a fairly regular basis (daily). Flourish should be dosed less often (semi-weekly or weekly) since its components are not rapidly depleted. Daily dosing with Flourish can lead to unwanted algae growth. By having these supplements as separate products, the hobbyist can add Flourish Iron™ every day and not risk unwanted algae growth while still adding the necessary level of Flourish™ on a less regular basis.

Q: I've got a 40 gal heavily planted tank with Flourite substrate. I started dosing with Flourish Iron a few weeks ago due to pale leaves on pennywort, etc. The color has improved. I'm adding a capful every day to the tank; an hour after adding, my tank shows no iron with the Hagen test kit. Are the plants grabbing the iron? Or is it precipitating out somehow.

A: I am confident that the iron is being consumed. If it was precipitating out of solution, you would notice a white chalky haze to your water and a white colored coating to your aquarium walls, heater, filter, etc. Our Flourish Iron is a very different type of iron. Our's is bound to a carbohydrate that is very easily metabolized by your plants. Most of the others on the market are chelated iron supplements and your plants has to expend large amounts of energy to get the iron from the chelate to be able to use it.


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0474 Flourish Iron 50 mL
0475 Flourish Iron 100 mL
0476 Flourish Iron 250 mL
0473 Flourish Iron 500 mL
0478 Flourish Iron 2 L
0479 Flourish Iron 4 L