Ok nice one, I will make sure the next feed mix is at 7.0, is it worth just giving them a light water just with the ph+ in as soon as it arrives? Might have a dig around in the kitchen cupboards and see if there's any baking soda hiding in there. Surely the quicker I can get the soil ph up the better. I checked the PM website as well, and it basically said don't mess with the ph using their soil, I might give them an email and tell them that approach definitely didn't work for me!