My Maxspect Aeraqua Duo AD600 Protein Skimmer is losing power when I got it I had the pump at 50% and with was skimming all the way up the neck now several months later I am at 100% and bubbles don't even reach the bottom of the neck and about every couple of days Bubbles just stop and its just water in the chamber. I have to lift out of the water to get it to start making bubbles and I have already taken it out and cleaned don't know what to do.