sorry about the ques.

[monkeyman164]

well been running for about 4 days now with lr was wondering what is this brownish looking stuff that seems to have covered them is this normal?

 

[melosu58]

A pic would be good. I`m going to move this to the ID forum. Is it dusty or gel like. Need some help here on some of its aspects.

 

[Fluff]

Sounds like diatoms and they are normal. They should burn themselves out. A pic will help in knowing for sure though, as mentioned.