hey there NoTrix, You're right in your assessment and you've got the right idea with the microbe tea, these will stabilise the in-soil pH nicely , but it will take 10 days or so. What you absolutely dont want to do is to create pH fluctuations , so pH down your tap water to around 6.0 and maintain that pH throughout. Another thing you can do is use humic acid . this will equalise your in-soil pH to 6.5 . Hope this helps ! π