Randy Holmes-Farley
Reef Chemist
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My Tank Thread
Humans use iodine in the thyroid during hormone synthesis. We are pretty different from inverts though. I am unfamiliar with shrimp physiology.
They have no demonstrated need for iodine. Many reef organisms have a clear known need, though we do not keep most of them. There is not a single mention of iodine supplementation being useful in all of the literature on shrimp aquaculture, nor in any scientific publications.
Many people believe that some zooanthids and other corals benefit from supplemental iodine, but others note no such effect. I’m not sure why that is, but it is easy to try iodine dosing and see if there is any apparent benefit to any given tank.

