An update on the sulfur. I mixed quite a few pellets in a gallon of water, let them disolve, and added them to a pot of soil with no plant in it. The soil was 7.2 before adding the solution, and has dropped to 6.0 with the solution. I may want to cut back on the amount I end up giving my real plants, but it seems to work fairly quick. I'm just scared now of dropping the PH too far.