New reef tank

Hello all, my wife and I just purchased a used 58 gallon saltwater setup from Aquatic Environments.  A little background on my wife and myself, we used to have a 30 gal freshwater with cichlids until I got deployed to Iraq.  We had always wanted to do a reef tank, and we have the ability to now.  From what I can tell the tank is an Oceanic Ultimate 58 gallon, with a Pro Clear Pro Wet/Dry 75 sump w/ built in skimmer and a Rio 1700 return pump.  There are 2 power heads installed: 1 is an Aqueon 950 and the other appears to be a Hydor Koralia 1400 perhaps (no markings on it).  The heater that came with it is installed in the sump.  The light above is a 6 bulb t5 ho, possibly made by Aqueon.  Approximately 58 - 60 lbs of live rock and 60 pounds of sand.  We just got everything put together and running on Monday , 11 June, 2012.  With a little bit of research and plenty of help for Aquatic Environments, my wife and I feel pretty comfortable with such a large burden.  My only concern is the with the sump, the water level is a good 6 inches above the water line mark on the sump.  I fear that in the case of a power failure it will backfill enough to overflow.  I have tried various nights of the overflow box and no real change in water level in the sump.  I was wondering of anybody has any words of wisdom.  I will post pictures of sump and tank and components when I get home.  Thanks for any advice and wisdom.  I hope this venture turns into a blossoming hobby since my wife and I enjoyed freshwater so much.

 

Thanks all for the responses.  Here are the pictures now that I am home to upload them.

 The basic live rock aqua scape, thinking of adding a few more pounds of live rock, I think it looks a little sparse.

Here is the sump and you can see the water level several inches above the water level indicator.
 The back half of the sump with a built in protien skimmer.

Hydor Powerhead of some kind, I believe to be the 1400, larger then other ones i have seen.
Will take some water samples tonight and update the levels. 
Feel free to follow along while my wife and I get this tank up and running and look forward to any advice and wisdom.

 

@mthomp

That's what thought of the sump as well, it just started to fill up higher while running and seems to hold steady. By the way the sump is a Pro-Clear Wet/Dry Pro.

 

Just a quick update, I believe I solved the dilemma of the sump. I removed some of the water from the sump after turning everthing off, and readjusting the inner box of the overflow. Also found a few riders that came along with the live rock are starting to show up.

 

Water Levels after 48 Hours are :
Temp 78.8F
Specific Gravity 1.025
Calcium 600 ppm
Phosphate 0.5 ppm
Nitrate 0 ppm
dKH 9%
Ph 8.4

Lots of particulate air bubbles in water though.