Coralife Biocube 32 Water Level

[Arget]

I just set up my Biocube last week. I'm currently cycling it, but the filter is very noisy. If I don't put enough water to spill over the top of the divider between chambers one and two, then chamber three doesn't get enough water and bubbles out the outflow. I enough water to go over the top of the divider between chambers one and two, and it is water running pretty loud. Is it supposed to make that much noise? Or am I doing something wrong? I can't find any way for the water to move between chambers one and two aside from going over the top, or a slight gap on the bottom.