175g Saltwater predator tank - Update:Aug 10th/10- FISH ADDED

[snow1]

July 21,2010 update:
The rocks, sand etc... has now been in the tank for 6 days. Things seem to be going okay. The only problem with the water I'm having right now is the ph, it's at 7.5 and I need it to be 8-8.02. I'm seeing some brown algae that is forming on the live sand, not sure what is causing that. Does anyone have any ideas? I'm planning to get more live rock when I get back aug 5th, I'm going back home for 10 days so I'm hoping to check some fish stores while I'm
there, see if anything has changed. I have changed the structure of the rock three times now, this seems to be working for now, once I get more live rock I'll see if I leave it or move it around, I'd like some really nice big pieces as a base rock for the bottom and I have found someone that has nice pieces.
Here is a video:
http://www.youtube.com/watch?v=pXmx7gMLmT4
pic:


Can anyone help me though with my ph problem? What about baking soda? Will that work? If so what's the ratio (tsp per gallon).