I have a 90 gallon Pro Star AIO that we filled up for the first time earlier this week. We cannot get the water level in the filter sock chamber to stay at a consistent level. We've tried dialing up/down the water flow as well as manipulating the level of the return pump and the water is still fluctuating. The salinity of the tank is not changing. Once the water level starts to change the noise in the tank becomes very loud. In all honesty the noise is the main issue. If the water level in the filter chamber is at a specific level it makes no noise at all, however, we can't get the water to stay at that level. Does anybody have any suggestions?