Does anyone here dose iodine? There aren't many posts concerning iodine and what it is good for. I was just curious to find out who doses it, why do you dose it and what kind do you dose it with? Are there any corals that require it?? or inverts? Reason being, my buddy just gave me an extra bottle of Kent Marine Tech I iodine that he had left over from his old reef tank. I don't think it has even been opened yet. I also read somewhere that this stuff is hard to test for, is this true? I hate putting anything into my tank that i can't monitor. Any ideas on iodine?