My medium pH currently is sitting around 6.8-7.0. My plant is not showing any signs of deficiencies but I'm worried that it soon will start to. I'm growing lambs breath in a 5 gallon smart pot with gaia green all purpose and power bloom pre mixed into the medium and have been watering with pH'ed water around 6.5-6.7, and my plant is about 2 and a half weeks into it's cycle. How would I go about lowering my medium's pH, should I use aluminum sulfate or elemental sulfur, and how would I apply either of these to my medium?