Well, like a moron I tightened the outlet on my Eheim 1048 and heard a small crack. There's the tiniest hairline crack, but it's enough to start a leak. It shouldn't be difficult to fix, but I'm not sure what to use to plug the crack. I was looking at a product called Marine Goop that I can pick up at the local Home Depot. Does anyone know anything about this product? Does anyone have any other suggestions? Thanks! 