Nizmo'-

soils- HF, OF- have been showing badly off acidic pH for some time now,.. not all bags are like this, some get them in OK pH, but many others have found out the hard way-

... Many cases show up in the Infirmary, linked to lousy soil pH! ..I'm only 450 miles from their home base, and the last several bags I checked
at the stores with an Accurate 8 soil pH probe, and each was in the low 5's

-- that's pretty much instant trouble,... So, before you use it, run a pH test on the soil... if you don't have a similar quality pH probe (skinny probe cheapie models at various stores are crap), then you'll have to do a run-off test... this is just an estimate at best, and useless when done wrong,... here's a link to an improved method- (
https://www.autoflower.org/threads/...-testing-and-ph-estimation.41733/#post-928975)... you can set up a soil only pot, say, 1gal, and test it... if it's acidic, you'll have to use a lime source to correct it.... Ag' lime, garden lime are faster acting than dolomite, and get stuff that's very fine, like powder,... it'll take a few days for it to get working,... let us know what the soil tested at!