iodide vs iodine

my real question is, is iodine different from iodide? if so what is iodide used for? i have corals that require iodine but currently i have a bottle Seacham's Reef Iodide. can i use that to supplement for my corals. i have one xenia frag and a toadstool. Thanks for any info.
 
well i did some looking and finally found a web site that states that iodide will break down into beneficial iodine. also that iodide in the most dioavailable form of iodine. so i guess i now know the answer.
 
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