Sump Question

[Fguinan]

Hi folks, I added a sump to my 150g tank a few months ago. If I stop the pump, when I start it again a load of whitish gunk gets pumped into the display.
Water parameters are good and sump is clean. The fish seem fine.
It clears up in about 5 minutes.
Should I be worried?
Thanks

 

[BIG-G]

Whiteish gunk?
Is it air bubbles being chopped into a very fine cloud?

 

[Fguinan]

Whiteish gunk?
Is it air bubbles being chopped into a very fine cloud?

Its not air bubbles... look like something is accumulating on the return pipe that comes off when the pump is stopped and started.

 

[esoxlucius]

Don't worry about it. It's just a build up of bio film in your return pipe. It looks unsightly but it's harmless. You can periodically clean your return at maintainance time and that will help.

 

[BIG-G]

I agree, if it’s not air then it has to be the film that accumulates on the inside of the plumbing.