Good to know. I'm also trying Destiny's Dark Matter soil for one of mine. So far it's great. All I did was add some power bloom in for the final stages.
Thought I'd pipe in since my method is very much inspired by Canucks.
I do add a little worm castings, fish meal, etc. to the mix as well, but I PH to about 6.5 and my girls are as happy as can be. I've also used the PH perfect line and found those bring my water down to almost exactly 6.5 as...