Iodine/Iodide

[Madreefer]

I usually add a little iodine and epson salts to my top up reservoir. At my LFS they now only have Iodide. So what's the difference between the two of them?

[whatcaneyedo]

More than you ever wanted to know about Iodine and Iodide:

Iodine in Marine Aquaria: Part I
http://www.advancedaquarist.com/issues/mar2003/chem.htm

Iodine in Reef Tanks 2: Effects on Macroalgae Growth
http://www.advancedaquarist.com/issu...l2003/chem.htm