This is a shot in the dark, but check your motor housing... I don't
even know if they have oil, but maybe if it is cracked, slight amounts
maybe leaking?



On Fri, 01 Aug 2003 12:29:56 GMT, "David Ritter"
wrote:

I've noticed an oil like slick with a blue tint on the edge of the water in
my power filter. It's a 10-20 gallon Whisper Filter that hangs on the back
of the tank. I only see this substance on the water before the carbon
filter. I clean the filter system and it comes back within a week. Any
thoughts?