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Re: Aquatic Plants Digest V4 #431
> From: "Neil Travis" <travisn at gravity_net.au>
> Subject: Iodised salt.
> Iodine is not added to table salt because people need it but purely to make
> it flow better as normal cooking salt which has is not iodised tends to mix
> freely with water and as such would clog up the salt shaker etc. and goes
> hard with moisture from the air as salt is hydroscopic. Iodised salt in high
> concentrations is poisonous to fish and should not be used in an aquarium
> only natural or non idodised salt is suitable.
Wrong. Iodide is added to salt as a dietary supplement. They add other
stuff (like "yellow prussiate of soda") to prevent caking.