Planted Aquaria


Iodide supplement to encourage regular exoskeletal molting of ornamental shrimp in all planted aquaria


  • Provides iodide, utilized by crustaceans (shrimp, lobsters, and crabs) to molt or shed their exoskeleton, enabling the crustacean to grow.
  • Formulated specifically for ornamental freshwater and brackish water crustaceans maintained in planted and/or biotope aquaria.
  • Helps prevent iodine-deficient issues in fish, such as goiter, by providing this critical element in a time-release form.
  • Used in conjunction with the appropriate Florin supplements, helps establish and maintain proper water chemistry in planted and community freshwater aquaria.
  • Contains no phosphate.
  • Formulated by a marine scientist.


  • 125 ml
  • 250 ml
  • 500 ml
  • 2 l
  • 20 l

Technical Background

Shrimp, lobsters, and crabs share in common an exoskeleton composed of a chitin/calcium carbonate composite material.  The growth of crustaceans involves secretion of a new exoskeleton and molting of the old one; early life stages of crustaceans undergo constant molting to arrive at the adult stage, whereupon molting continues throughout the specimen’s adult life, albeit at a lower frequency. Iodine addition to closed aquatic systems housing crustaceans has been consistently shown to elicit molting in specimens that had not done so previously.

Florin-I provides iodine and iodide, the former in a time-release low-level method, the latter as a free ion. For optimal results, ensure that crustaceans receive appropriate foods and that the water chemistry in the aquarium is maintained within the proper respective ranges. TDS/General hardness, alkalinity, and elements that improve crustacean coloration and food utilization are provided by Florin Delta GH+, Florin Delta KH+, and FlorinMulti, respectively.

Does not require refrigeration. Maintained free of contaminants, remains viable indefinitely. Not impacted by temporary freezing.

Instructions and Guidelines

Shake product for 3 – 5 seconds before each use. Begin dosing by adding 1 drop per 10 US-gallons (37.9 L) in the aquarium per day for a period of 10 days. If no molting occurs, then dosage may be increased by 1 additional drop per 10 US-gallons day (a total of 2 drops per 10 US-gallons per day). Once crustacean molts, continue dosing rate and volume for an additional 5 days, then decrease to 1 drop per 20 US-gallons (76 L) per day for 30-days (longer if you do not wish to elicit another molt until after the 30-day period).

Daily dosing is critical to eliciting the molting process. Crustaceans often hide for several days after molting to avoid confrontations with rivals or predators while their exoskeleton hardens to normal strength. Calcium is very important to chitin formation in crustaceans, and is provided by Florin Delta KH+. To benefit crustaceans, simply use that product as directed on the label to maintain proper calcium content in the aquarium for plant health. Water with very low TDS (<150 ppm or ~3 dGH) and/or low carbonate hardness (alkalinity) inhibits the formation and hardening of chitin.

Health and longevity of all captive aquatic organisms, including crustaceans, depends upon proper feeding and maintaining water temperature and chemistry within required ranges. Florin-I will not elicit molting unless the resident crustaceans have the necessary nutrients provided by feeding and are in good overall health.

Caution: Keep out of reach of children. Not for human consumption.

Guaranteed Analysis

Total Iodine (min) 7,500 ppm.


Purified water, USP-grade Potassium iodide and stabilized iodine.