Micro Bubbles

[Chad]

ok, I need some help.. I cannot figure out why I am getting bubbles in my plumbing. Everything seems to be completely leak free, ie: no salt creep on any of my plumbing fittings.. but whenever a pump starts, I have an alternating closed loop, it always blasts massive bubbles into the tank. Plus on occasion a steady stream of bubbles will poor out of the outputs.. everything is under water.. I just don't see where the air is coming in from..

Anyone have a clue????