Ferrous Pro 2L


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Most hobbyist never think about supplementing things beyond the basic skeletal ions of calcium and alkalinity and the occasional magnesium.  Granted Iron (Ferrous, aka Fe) isn’t mandatory for keeping many of our marine animals, it is however important for coloration and pigment creation in stony corals. It is also extremely important in applications where refugiums and mass macroalgae is being cultivated.

ReefGrow® Ferrous Iron Pro provides an organic compounded iron which is readily available to both corals as well as macroalgae. Macroalgae will quickly strip valuable iron from a reef system and once depleted will begin to turn from a dark green to yellow.  So for longevity of macroalgae iron is extremely important.  Maintaining proper iron levels will increase the speed at which macroalgae grows, thus helping to transport nutrients from the reef aquarium for better usage by your macroalgae.  It also decreases the likelihood of Caulerpa sp. undergoing sexual repoduction and causing explosions of nutrients in the water column.

Iron also is used in photosynthesizing organisms (coral included) in the breakdown of CO2 into C6H12O6 (which is a simple sugar aka glucose).


Empty contents of this package into a clean and sealable two liter bottle.  Add enough water to fill to two liter mark with distilled water or RO water (again why pay premium price for something you already have.)  Finally secure bottle tightly and shake well.

Note – Always do proper testing before dosing your aquarium. ReefGrow® recommends you keep levels close to that of average natural sea water, the way nature intended, for optimum health & longevity of your reef.  Average natural seawater total iron levels tend to be at or around .25 ppm (25 parts per billion).


Beginner – Use .4 mL per gallon (4 mL per 10 gallons) of tank water daily. Check iron levels regularly and adjust dosage amounts accordingly.  You can also use our friendly web-app to build customized weekly dosing schedules.

Expert  – Each 4 mL/10 G raises iron by about .03 ppm.  Calculating your actual usage by testing and modify your dose levels accordingly to keep iron levels balanced.  Then only replenish what your reef uses in a given twenty-four hour period.

Additional information


2L Refill Packet, 2L Jug


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