i just bought a 180 gallon tank got it set up and full i filled the wetdry to the full line and made sure i had enough water to fill my 3 water lines leading back to the tank im running a little giant pump model# 4-MDQ-SC witch is rated at 1325 GPH, 1/10 HP the problem im having is that when i turn the pum on im draining my wet/dry to the point im pulling air and my over flows are working so hard that im filling the chamber where my filter sits above the bioballs to the point where it is overflowing the it in to the sump and past the bio ballsis this normal if not what can i do ? thanks all