Red Dust Algae???

[JoeBanks]

Ever since I accidentally overdosed CaCl2, my long-term GDA problem has disappeared, and has been replaced by a similar algae which grows only on the glass, looks like GDA, but is reddish brown. It also seems to grow more slowly than GDA.

What is this stuff?

 

[Tom Barr]

I saw this recently, I've ID ed it yet.

Regards,
Tom Barr

 

[JoeBanks]

It is, at least, less agressive, less noticeable, and easier to deal with.

Maybe a CaCl2 overdose is a GDA killer?

Could be worth a controlled experiment.

 

[Tom Barr]

Well, it's not likely the Ca, more likely Cl.
A good scrub and good general maintenance seesm to do the trick

Regards,
Tom Barr