hello thank you for the wecome
its 125 gallon tank.
I ahve two pumps - one is unknown (from the sump to a UV
The other goes from the UV
Sterilizer back into the tank, and its 700 gph
The problem seems to be in the overflow - which is a box that hangs on the back of the tank. The overflow box part A sits INside the tank. The rim of it is cut into fingers. The water flows through these fingers into the box. A syphon tube takes this water and puts it into box B on the back of the tank. A hose connects box B to the sump. This hose came with a round sponge that is supposed to fot around it. When I put the hose on, it seems to start making that awful noise because the water is not getting to the hose fast enough, thus creating the slurping/draining sound.
If I take the sponge off, the sound goes away. I have the system balanced out finally, but still the sponge makes the sound. I am just not familiar enough with this to get it all correct