I've trying using the search engine but couldnt find any answers. I have a Penguin 330 and 170 running in my tank. I also have two bubblewands across the back of the tank. The bubbles get into the filter intake and it makes a grinding noise. I was wondering if there's anyone here that had the same problem and how they went about fixing it. I tried searching the online hardware stores to see if they had an "S" shaped coupler but couldnt find one. Any help would be appreciated.