Need some help please!... lets start in the begining, i have a 400 gal tank with a pro clear aquatic model 400 wet/dry, my old pump was a supreme model 36, when pump died i purchased a new gen-x model pcx70hp pump and installed it. i like this pump much better, it is deffinitly much quieter, but now for the problem. everything seems to be working fine but i am getting fine bubbles from the return lines, there are no bubbles in the sump, just cant figure out were these bubbles are coming from. Any help would be greatly appriciated!