I have a Hang On Back Corallife65 protein skimmer on my tank. All was well until about a week ago. What happens is it will stop sucking air through the tube attached to the silencer. If i remove the silencer ( or whatever its really called ) and suck water through it until its almost in my mouth then blow the water back into the pump until i manually cause it to start sucking air again, it will work for anywhere from 1-5 days. ( with excessive bubbles introduced into the tank ). Sometimes it will work well, with minimal bubbles in the system, but its sparatic and aggrivating. Any suggestions? Im avoiding taking the whole thing off and cleaning it out but if thats all the problem is i guess it could be worse. Thanks for any input/advice.