brown algae or diatoms in skimmer

[TheSaint216]

I have a clear acrylic Skimmer, reef octopus. Its not to far from my lights. I'm noticing brown gunk which looks like diatoms sticking to the acrylic inside, about 2 inches below the collection cup. Should I try to black that section out or is this normal inside a Skimmer body?

Thanks

 

[ScottRT]

I have gotten a similar film on both of my last 2 skimmers. I believe it is somewhat normal. You can purchase a flexible bottle brush (they sell them at beer and wine making store) to get at the hard to reach areas also.

 

[TheSaint216]

Did u break it down and clean it out? Wondering if it would have to break in again if I did that?

 

[ScottRT]

No, you can actually just take off the collection cup and pace the bottle brush down in there and scrub it out.

 

[TheSaint216]

Cool thanks guys

 

[jim.crunk]

It's fish poop. Really! Cleans easily, but quite nasty.
My SRO does the same thing with no lighting in the sump area.