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[APD] RE: Green spot

> > We shall see how long your method last since Green spot is easy to have
> > infect via airborn sources.
> > I don't have it and know what causes it.
> OK, I'll bite :-)  What causes it?  This, and some accompanying dusty
> on the glass are the only problems I have in my tanks (unless I neglect
> them).  I have to scrape once a week to keep it off the glass.  Not a huge
> problem, but it would be nice to get rid of it as well.
> Thanks,
> Terry S. in AZ

Low PO4/low CO2

Add PO4 high(~1ppm or higher) and CO2 high.
Keep it there.
Also works at low light.

Tom Barr

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