I use stuff called Get Down and it is an acid additive for my water.
Normally I collect rain and I never had any problems
but there has been none in So Cal for many many months
and my plants have some yellow leaves. Most likely from using water
from the hose day after day like I have had to.
The guy at my local hydroponics place
told me about this stuff and you only need a little
bit to lower the pH level... I have noticed a little difference so far
but I have just started using it and they are budding now.

but your stuff looks awesome man. Real nice.:thumbsup: