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Seachem Laboratories Reef Iodide - 250mL


Item #: SC1613

Temporarily Out of Stock

Reef Iodide™ is formulated to provide a safe source of iodide that will not convert to toxic free iodine under storage or reef conditions

Iodide is an important element required by invertebrates and many soft corals (gorgonians, sarcophytons, etc). Reef Iodide™ is a concentrated (8,000 mg/L) stabilized potassium iodide source for reef aquaria that will restore and maintain iodide levels to those found in natural sea water. It is formulated to provide a safe source of iodide that will not convert to toxic free iodine under storage or reef conditions. Iodine is as toxic as chlorine and should never be used in a reef system. However, iodide is as safe as chloride.

Most iodine supplements on the market are simply potassium iodide or a medicinal disinfectant commonly known as Lugol’s Solution. Lugol’s is a highly concentrated iodine/iodide solution that is highly toxic and intended for disinfection. Although such products are sold for use in reef aquaria, we believe the risks vastly outweigh the potential minor benefits.

Potassium iodide only products are a safer alternative but not very effective alone owing to the unstable nature of iodide in the aquarium environment. When added to an aquarium environment, iodide becomes unstable converting to elemental iodine (which is biocidal), iodate (which is useless to corals, toxic at elevated levels, and can`t be tested for), and iodide which is the only form of iodine available to corals for uptake. These products` inherent instability makes them potentially dangerous to coral health. Unlike competing products, Reef Iodide™is complexed to a stabilizing compound in order to keep it in the iodide form when added to the aquarium. All of the product remains usable and fully bio-available.

Directions for use:

  • Beginner
    Add 5 mL (1 capful) for each 200 L (US 50 gallons) every other day.

  • Advanced
    Add 1 mL for each 80 L (20 US gallons) daily to raise iodide by 0.10 mg/L. If necessary, adjust amount so that iodide reads 0.06–0.08 mg/L 6–12 hours after the last amount. Thereafter, use this amount daily and check iodide twice a month.

  • Expert
    After determining the iodide consumption rate, set up a continuous drip system. Use the following formula (or skip the math and use our Dosage Calculator) to determine how much to add to your top-off water: m=0.125vi (m=mL of product to add to top off water, v=volume of tank in liters, i=amount to raise iodide in mg/L). For example, if you want to raise iodide by 0.10 mg/L in a 200 liter tank, then you would add 0.125x200x0.10=2.5 mL into the top-off water. [For reference: 1 gallon=3.8 L].

  • Notes
    It is normal for iodide levels to decline after a few days. This results from utilization and chemical depletion. Therefore, amount and/or frequency of use can be varied. Amount used can be adjusted based on coral response. To check iodide levels use Seachem’s MultiTest™ Iodine & Iodide test kit.

Manufacturer information

Seachem Laboratories, Inc. was established in 1980 by Dr. Leo G. Morin. Seachem moved into a state of the art 110,000 square foot facility in Madison, Georgia marking their 25th anniversary in the industry in 2005. This facility includes production and research laboratories, manufacturing, inventory, shipping, and office space.

5 Stars


Reviewed on
April 22, 2020

Yes, I would recommend this.

Saved my Goni

Pros: Fast benefits for corals and inverts, easy to use.

Cons: none

My 2 years pink Goni completely retracted and bleached, ICP showed slightly low iodine, decided to dose this product every 2 weeks 10 ML on a 125 to keep it just above .06 but less than .09 on the Red Sea Iodine Pro test Kit. The Goni came around and is looking better than ever.

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Reviewed on
January 07, 2020

Yes, I would recommend this.

Great Additive

Pros: Safe and Easy

Cons: Can overdose if directions not followed.

Great way to increase iodide levels.

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Reviewed on
February 25, 2018

Yes, I would recommend this.

Best Iodide in market

Pros: CAN NOT Overdose.

Been using for years. CAN NOT oversose. Marine Depot great job on ur packaging on liquid additives and every single product Ive purchased from you. Thaanks

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robert goldsmith

Reviewed on
March 18, 2015

Yes, I would recommend this.

Tank balance

This product along with a few other Seachem products help keep my tanks balanced and very healthy. I have recommended this product to my fellow tank owners.

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steve rivara

Reviewed on
January 08, 2015

Yes, I would recommend this.

Seachem Laboratories Reef Iodi

it works great

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robert rueckert

Reviewed on
April 26, 2011

Yes, I would recommend this.

great proguct

This reef iodine is a great product which I have used for years. Thsnks Seachem and all your new aquavitro products are great. The salt is excellent!

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jeffry burd

Reviewed on
June 22, 2010

Yes, I would recommend this.

Great Iodide

Have always used this product without any problems. With other Iodide Solutions its very easy to overdose tank with deadly results. I need to dose with this product about every 3 days as skimming&Corals tend to deplete Iodide. After dosing I shut off the skimmer for about 24 hours. Very difficult to overdose system using this product as it is very forgiving but would test water for proper Iodide levels.

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Reviewed on
March 10, 2010

Yes, I would recommend this.

Seachem Reef Iodide Review

After 24 hours of utilizing a capful of Seachem Reef Iodide, I notice more activity as well as growth of my invertebrates. Invertebrates appeared that I didn't know where there.

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sandy cohen

Reviewed on
April 23, 2009

Yes, I would recommend this.

doog 'dine

developed by a chemistry professor, works great

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kenneth pacheco

Reviewed on
March 20, 2008

Yes, I would recommend this.


I can definitely notice a difference in my corals when I don't use it as compared when I do. They seem more colorful and much healthier when I am using this product regularly. I also like the fact that its iodide instead of Iodine. I would definitely recommend this to anyone.

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