Interesting, I had no clue about that. I'd read the posts speculating in the past, but never saw a "definitive" conclusion.
So what's the consensus of the community on these? I have a bag of the gems in my rear sump chamber, mainly because I wanted to have something to transfer to a future tank to aid in cycling process. Is there are better product to use that doesn't leach Aluminum? Do we even care about the Aluminum if there's nothing wrong?
I fear ICP tests may make people worry about problems that aren't problems. I know I'm this way with parameters... I get freaked out when everything isn't perfect then have to remind myself that the tests have a margin of error and the inhabitants have been fine.