I do dose Iodine, otherwise I cannot keep it in the acceptable range. As I noted, Lithium is always high, which I attribute to the use of IO salt. I think that's also the reason for slightly elevated Copper. Magnesium is on the high side of the acceptable range, so probably nothing to do there; though I have stopped using dolomite supplement in my CaRx. P/PO4 is higher than I had expected; I may run GFO again. My chaeto is not growing, so I suspect the tank may be nitrate starved; haven't tested for NO3 in a while.
I only do modest water changes - nominally 45 gallons via AWS over two weeks. Total system volume is 700 gallons. Very high fish load, probably too high, with 12-15 cube equivalents of food daily.