i recently just moved i have a 20 gal saltwater tank.. my question is when i plugged my filter in it makes a loud noise after a couple of seconds like water isnt getting sucked in i made sure everything was in place were it should be and still nothing even pouring water into the filter while running doesnt help. . i really need to get it back up and running before anything happens to my fish. . i do have a a powerhead in there just so there not in still water. . any help or suggestions would be appreciated. .