Setup Question - Overflows

I am setting up a new reef tank. I have a 120 gal AGA with Megaflow system. I have my sand, live rock in place and finishing putting the water in. I have a dual overflow, and one side has filled up (and has let some of the water in the sump tank), while the other side has only a very little water in it. My first thought was "oh no, my tank isn't level", but I really think it is. I checked before and after setting my aquarium in place. Can anyone think of why one side would fill before the other? I am sure there is a high probability that this is a stupid question.

 

Its not level or the slits are lower on one side

 

One overflow might have been installed a little higher than the other. You may just need to add more water to the system to make things work right.

 

So let me get this straight.
One overflow is full and the other side has very little water in it.

Is the water level in the Tank up to the overflow slits on the one with little water in it?

J

 

Maybe the overflow requires a bigger tank? The OF I have will work for up to 120 gallons and it has one outlet. Maybe the one you have works for 150+gallon tanks? How many gph will it take?

 

I believe he has a predrilled "reef Ready" system. So the overflows look like this


Am I right


J

 

yes Jason, this is exactly like my system. when the water level in my sump reached within about 2 inches from the top, as instructed by my local fish store mentor guy, I went ahead and fired up my pump, even though one overflow was still low, while the other was near the top. Everything is working fine and both overflows are working the same. another newbie getting all nervous for nothing.

 

Oh good. Glad it's working.

J

 

Cool! You newbes anyway