I too use tropic marin pro and Icp analysis has tested levels of arsenic. I contacted tropic marin about the issue and they ran an independent Icp test that showed arsenic in the same range tolerance but claim it’s not harmful, which seems true so far as I have 60+ happy acros. Here’s an icp analysis I did on a freshly made batch of tropic marin pro.Thanks @Piranhapat for the encouragement. I would be really happy if it is just time that produces results. I haven't really seen any encrusting yet either.
I have done multiple ICP tests - see below for my Triton, API and Coralvue tests all done on the same day:
Triton
ATI
Coralvue