hey, I have a question. Im growing in 90% peatmoss soil (dont have any other choice) The pH becomes more and more acidic over time. I think i had a pH of 5.5-5.7 3 months into my last grow. So i need to stabilize the pH. How can i do that? Ive heard i can add CaS04 (plaster of paris) in my soil mix to create a pH buffer. is this correct? If so how do i go about doing this?