Yes, to learn much, we need aquatic plants under horticultural conditions with CO2 enrichment, then induce algae and measure rates of growth.
You can use artificial media such as glass slides or small ceramic tiles placed in random locations all over the tank for say 1-8 weeks.
You take these out and check a few under a scope to confirm and photograph the species.
Next, since you can measure these tiles area, you place them into hot 90% ETOH into a water bath at 70C for 10 min or 60C for 1 hour etc.
You can measure the concentration of Chl a and get a good base line for algae density and biomass using a simple spectrophotometer.
http://algalweb.net/Methods/Chlorophyll-ethanol-extraction.pdf
Some of the methods can be skipped above since the entire sample can be added to a test chamber/tube etc.
No need to filter from the water. For methods, research yes, but less so for hobbyists, this is not a hard method to follow. I did thousands of them.
This acetone method with the sampler will give you a nice curve:
http://www.jenway.com/adminimages/A09_001A_Spectrophotometry_of_chlorophyll_a_and_b.pdf
But acetone, meth etc, they are quite toxic, not too bad for 90% ETOH, old demon rum.
These methods have some issues, since they are not optimized specific to the species that plague our tanks, but you could correlate some on the GDA with the above paper Dutchy linked. I'm not sure it's the same species, but the genus is good.
That would offer decent support then.
I tend to think generally CO2 enriched tanks when they get algae blooms, are much more intense than non cO2 enriched tanks. But the higher light generally in CO2 enriched tanks skews this data also.
Hard to say.
I've never had much issue for logn at home with this alga.
Green hair was more an issue, but that's not even an issue.
These days, it's Bladderwort(veyr hard), snails(extremely hard) and Riccia(moderately hard).
Algae, not so much.
A client got more GDA recently.
I added more plecos to see if it will work again.
Since I cannot do many other options for this client, there's not much recourse really.
Unless I wipe the tank 2-3x a week, I cannot do a blackout of let it be for 3-4 weeks then wipe......
Neither is really an option. I tried EM dosing also, made matters worse.
Plants, moss, stems and foreground does well, they grow and Xmas moss tends not to look good or attach well with poor CO2.
Fish feeding might be an issue for other reasons.
Lights are the same type and bulbs as my tanks at home.
CO2 is good but not 100%. I cannot sit and watch the tank for a few hours or near the end of the day cycle to assess the CO2 effectively.
I'm not willing to kill fish with CO2.
There is copper in the pipes, but I flush it prior to water changes and run a carbon block prefilter before the tap enters the tank.
Never had much snails the last few years and never shrimp success.
http://lup.lub.lu.se/luur/download?func=downloadFile&recordOId=136521&fileOId=624597