I would have the PHs point at eachother, at each end of the tank like you already have. That might be different for reefs, I'm not a reefer.
I think you might look into more LS
as well... I have about 60-75LBs in mine (I lost track because I added it at different times).
So do you already have the water in the tank? I would add the sand, slowly add the water and then the LR
and skimmer. Let the sand settle and you are well on your way. If you already have the water in the tank, some use PVC
to add the sand without the sand storm. I put my sand in a bowl, let it slowly fill up with water, then let it sink to the bottom and pour out the sand...of course, you might want to think about turning off everything electric in the tank, just in case the heater breaks or something like that.....
As for the LR
, some folks recommend hirocks.com . I just went to their site, it looks like it is just base rock. You might need some actual LR
to seed the tank and rest for the rock. I spent the extra $ at my LFS
(about the same price as yours), because I could select the pieces. I'm sure others can give props to the places they have bought LR