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Haha I love how this thread went from "I have added nothing that would increase barium" to "oh I changed to a new GFO two weeks before the test"! The first thing I would have said would have been GFO. I have seen this countless times now from a specific type of GFO, which comes as a larger granule (confirmed on various ICP tests on various tanks). The different brands are most likely from the same source.
I actually am currently running a mixture of this GFO type and an aluminium oxide together, in order to see if my this will cancel out the negatives of both (aluminium and barium leaching). I have previously registered upto 120ug/l of aluminium when using an aluminium phos remover and I felt this level was detrimental to the polyp extension on my corals. Although I could also day this about the angel fish I had at the time, so it's not all science!! Haha
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