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WHat is this?

I finally got a tds meter the water going in to my ro is 201ppm the water coming out is 1ppm. Good? my question is i get this brown kinda spider web looking stuff on my glass and on my rock. its not thick and takes a few days to be visible. But its annoying and if i let it go for 3-4 days i start getting little clear bubbles. DOes this sound familiar to anyone? can you identify?
 

JohnS_323

Officer Emeritus
Officer Emeritus
What kind of salt are you using? We got the same thing when using Red Sea Pro. I think it was related to high silicates in the salt.
 
Its strange its like a stringy brown but doesnt appear to be hair algae. Its annoying cause it gets on my coral and rock and i hvae to move a power head to it and then it comes right off. When its on the glass its like a spider web. If i could ever figure out how to post pictures on here i would take a picture.
 
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