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- Jun 7, 2018
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Thanks for the info.. Clearly Cerium should not be used.. Wish the manufacture would have updated the spec sheet.The element, Cerium, has 2 stable oxidation states, +3, and +4. So you will either have Cerium trichloride, or Cerium tetrachloride, which is also toxic. Here is the MSDS for CeCl4 https://fscimage.fishersci.com/msds/04387.htm
Heptahydrate just means there are 5 water molecules for every CeCl4 in the crystal matrix. When it dissolves it just becomes part of your aquarium water and has no effect on the properties of the compound in solution.
Also, there is only 1 stable isotope of Cerium, which has an 88% natural abundance, so it's definitely possible there could be some radioactivity going on as well. Although judging by the extremely long halflife of the most common radioactivity isotope, it probably isn't super radioactive.
I would just stay away from heavy metals in general.