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I'm not sure which green algae is on (some) of my plants. All I know is that it is green. I also cut back on duration and cut out my midday burst. It has helped a bit.
 

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I'm not sure which green algae is on (some) of my plants. All I know is that it is green. I also cut back on duration and cut out my midday burst. It has helped a bit.
Rub a leave that has it between your fingers. If it's slimy it's likely not GDA and could be a type of BGA (cyanobacteria).
 

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It is definitely not BGA.
The texture is a bit rough.
I wouldnt recommend touching cyanobacteria as it contains hepatotoxins (liver toxins).
This algae usually only shows up in polluted tanks (high PO4 and other nutrients) and feeds off of light heavy in the yellow/orange zone (~600nm +/-) where phycocyanin peak absorbtion occurs. Neither of which I have. Plus I dont have that manky odor either.

 

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Newt, just to clarify is that graph for the cyano or for the dust algae? I've never read about that before, pretty interesting stuff, do you have a link to a larger article? I'd like to read more about it.
The graph is for plant photosynthesis absorbtion rates for the different chlorophyll and such that plants use in the photosynthesis process. I think I got this graph off of a university website site that was doing experiments on photosynthesis. Over the years I have collected many different graphs while researching plants and lighting. I'll see if I can find the website. It was a good article as I remember.
 

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Gsa is very thin and grows like a birthmark on the leaf. It doesn't raise away from the leaf at all. It is flat sort of like a discolouration of the skin. A Dark green mark on the leaves. Normally on Anubias you can see some in even the most perfectly balanced tanks.

If it protrudes from the leaf at all then it isn't GSA.

AC
 

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I would say it has a textured surface. The SAE's, Otos and pleco eat it. Its on my Bacopa monneri, anubias and some rocks. It may or may not be all the same species but they are all green. Perhaps it is GDA. I do know I will sometimes get GSA on the rear glass as this is definitely spots and is different than the green stuff on the sides and front of the tank glass.

At any rate I have not conquered this yet.
 

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Thanks.:D
I'll try to get a pic of the Bacopa this weekend. It's a busy weekend but I'll try to fit it in.
 

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I'll take cleaning GDA over GSA or BBA any day ^^

My experience with GSA has probably something to do with the intensity of the lighting. Having my halide raised above the tank and other tanks next to the main tank (with the halide), i can see that the side of my other tanks are hit with GSA in certain spots where the Halide beams towards. No big deal, scrub scrub. In my other tanks that do not have halides but t-5's, i have no issues with this algae.
 
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