Yes...If I was you, I would run to any nearby garden store and buy a PH tester and get a handle on the ph, like weezy sez...For no matter what you grow in or whether you use MG or coco or do hydro....PH is rather critical to any good grow and if you're guessing Ph, you're missing out completely on learning anything else...There are Sticky's about it if you wish to know more about it, search and read. From my experience, if the Ph is right on, everything else is ez. Hope this helps!