I use All Mix as well and I always Ph my water to around 6.5. This has not messed up for the Ph of the soil. If you gave too much nutes, you will need to flush to get rid of the toxic salt buildup. That sound slike bad advice from your growshop.

Secondly, you don't need 2 ph testers. To test the Ph of your soil, ph the runoff water that drains out of your pot when you flush.

Now go flush those plants and work on the temps. To flush, give your plant 2-3 times the volume of the pot with ph'ed water. For instance, if your pot has a capacity of 2 lites, flush with 4-6 litres of water.
Zoidberg Reviewed by Zoidberg on . PLEASE PUT MY MIND AT REST! Hey guys heres my prob.I have posted a few times and glad of the help.I recently put my 7week old seedlings in my grow room,they are in bio bizz all mix.Well i recently gave them to much grow and the tips are yellow on some of them.Also they got kinda heat stressed at a temp of 100.Apart from a cpl scorched leaves they were ok.Anyway i wont to flush them but the guy in the grow shop said i didnt need to do the ph cz it was already set at the right ph.And adding ph water will mess it up.Granted Rating: 5