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I've been fighting GDA for a few months. Attempted the 21 day thing (tried let it go thru its cycle) but I only got to 15 days and scraped it off because I had company coming over- :).

Anyways....last week I tried cutting back the lighting period one hour and VIOLA! what a difference!! I've got hardly anything now and hope it totally vanishes!

Green dust algae....take your silver spoon and dig your grave...(apologies to Fleetwood Mac fans)
 

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I'm going to try one hour less. I already stopped my midday burst and I am seeing less.

Can GDA also grow on plants?
 
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