I have a Whisper Power filter model 40. I just purchased a Rena air pump model 100. I hooked the air pump up to a 23 inch bubble wand so the bubbles go along the entire length of the back of the tank (24in) and it looks great! The problem is that the Whisper filter is sucking up the bubbles and making really bad crackling noises. The water intake from the filter and the bubble wand both need to be at the back of the tank, so I can't move one of them. Does anyone know how to get around this problem? Any advice would be appreciated.