I had a potassium shortfall on my tank, I use redsea pro kit to test for potassium. My reading was just under 360, I have since bumped it up to 430 ish with zeovit k balance. I have found it useful looking at the new polyp extension on several of colonies of sps which had no extension before and with brighter blue coloration. I do run pellets on the system, I strongly believe while running a probiotic system potassium gets striped out of the system way too fast, one must replenish it with supplements to ensure sufficient levels are met. Ofcourse with most supplements I don't like to dose anything I can't test.
On a side note. I found feeding also aid polyp extension as it is the reason why there is polyps in the first place.
I am interested in the grounding probe. I guess it's time to stick the good old multimeter in the water and see if there is any stray voltage.
Keep us posted on the progress.
