Hi
We got a bag of non iodized salt from the supermarket just to find that it contained an anti caking agent 551 which is Silicon dioxide. This comes from sand or Quartz. It is also used in artificial sweetener, anti-caking agent, thickener and stabiliser in beer, confectionary, sausages, dried milk and a huge range of foods.
What I want to know is, is this anti caking agent okay for fish tanks. Will my fish be okay if I add the salt to my tropical fish tank (not marine)? Or should I just return it and look for another alternative?