Seachem Reef Aquarium Iodide Supplement, 500 mL Stabilised Formula for Corals

Seachem Reef Iodide is a concentrated supplement for reef aquaria, formulated to restore and maintain natural-seawater iodide levels with 8,000 mg/L stabilized potassium iodide.

• Stabilized potassium iodide — helps keep iodide in a usable form in the aquarium.
• Supports soft tissue growth — supplies an element required by invertebrates and many soft corals.
• 500 mL (17 fl oz) bottle — provides a concentrated source for reef aquaria.
• Made to maintain natural-seawater iodide levels — supports an appropriate iodide supply for aquarium life.
• Formulated to resist conversion to toxic free iodine — for stability in storage and reef conditions.

Iodide is an important element for reef invertebrates and soft corals, including gorgonians and sarcophytons. Reef Iodide is made for aquarists who want to replenish iodide in a reef aquarium while choosing a formula designed to keep the element in its usable iodide form.

Why add iodide to a reef aquarium?

Reef Iodide supplies iodide, the form of iodine available for uptake by corals. It is intended to help restore and maintain iodide at levels found in natural seawater, providing an important element for invertebrates and many soft corals.

• Relevant to soft corals such as gorgonians and sarcophytons.
• Designed to support soft tissue growth.

How does stabilized iodide differ from ordinary potassium iodide?

Reef Iodide is complexed with a stabilizing compound to help keep iodide in that form after it enters the aquarium. Unstabilized iodide can become elemental iodine, which is biocidal, or iodate, which corals cannot use and which can be toxic at elevated levels.

This instability is why a potassium iodide source alone may not remain effective in an aquarium. Seachem formulates Reef Iodide so the iodide remains usable and bioavailable rather than converting to these other forms. The formula is also designed not to convert to toxic free iodine during storage or under reef conditions.

• Iodide is the form available for coral uptake.
• Iodate cannot be tested for, according to the product information.

Why choose an iodide supplement rather than iodine or Lugol’s solution?

Reef Iodide provides stabilized iodide rather than a medicinal disinfectant. Seachem cautions against using iodine in reef systems and describes Lugol’s solution as a highly concentrated, highly toxic iodine-and-iodide disinfectant intended for disinfection.

Iodine and iodide are not interchangeable in a reef aquarium: iodine is described as toxic as chlorine, while iodide is described as as safe as chloride. Reef Iodide is formulated as a safe, easy-to-use source of iodide for reef aquarium use.

• Stabilized iodide source for reef aquaria.
• Not a disinfectant solution.

Seachem Reef Iodide suits reef aquarists seeking a concentrated iodide source for invertebrates and soft corals, especially when maintaining iodide in a usable form matters. Its 8,000 mg/L stabilized potassium iodide formula is made for reef aquaria, not for disinfection.

Read our guide: A beginner’s aquarium set-up checklist: from bowl to tank