Hey guys, i'm almost done with my first WC. Last night when i started to leak test my system (and threw some of the night) my L35 hydor sounds more like an industrial pump(you can hear it 20 feet away)Im using 1/2 tubing, 77 bonne,danger den blocks 6800, 478 RBX and a re-worked aqua computer res with 1/2 barbs. I had bubby that has done this alot more come over and help with some trouble shooting. He has not built a WC with the hydors but heard the same thing i did, that there is just a humm while the system is running. Any help would be greatly appreciated