I had GSA once it took a week long blackout to cure it. I removed as much as I could with out hurting plants quit dosing any ferts then blacked out the tank for a week. Then gently removed what I could from plants ( most of it came off) the a 70% w/c if I remember correctly. After all was said and done i assisted lighting and ferts and co2 and order was restored if you search the forums you should be able to find plenty of help
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