I gotta be stupid not to figure this out and is hard to ask but i gotta. Everytime i change my filterpads on my marineland 400 power filter when i turn the filter back on it shoots out all the debris throughout my tank that was in there. I tried doing it with the filter on, same issue. Im stumped and it is annoying this crap outta me not to mention contaminating my tank. Any help would be appreciated BIG TIME!