Black Algae?

[ShadowStryder]

Got my 600 setup and running 2-3 weeks ago. I now have what appears to be black algae growing on my vynil plumbing and silicone in sump. Doesnt appear in main tank as of now.

The only cause I can think of would be the driftwood I collected from river. Power washed it then let it dryout in sun before adding.

Was much to large to boil.

Any ideas of possible causes?

Pic....

 

[ShadowStryder]

After doing some reading I am wondering now if its brown algae since its common in low light and new setups. And its definitely a new setup and no light under stand.

 

[spotfin]

Does look like a brown diatom algae. Interesting that it is only growing on the vinyl, and not elsewhere.

 

[jwh]

Probably brown algea, common in newly setup tanks and should resolve after a few weeks