Yup, I'm waiting for the LFS that I bought my rock from to order some.
I was told that I should put the PH like that to break the water tension, but that was back when I had only 1 filter, each filter is rated at 350 gph, I'll move the PH like you recommended.
It doesn't look like it, but there's a good flow near the rocks, had about 6 mushrooms disappear, no matter were I put them, the flow just picked them up and tossed them around, haven't seen them since.
Hopefully by Friday I'll be able to order another PH, was thinking of a Hydor Koralia Evolution PH, but it seems that theres a bug on the site, now matter how many times I click on Add to Cart, it just refreshes the page.