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That's 3-4 kinds of algae, and the problem is that you aren't dosing. Dropping the light out helps, but what you need to do is an overhaul. Remove anything covered in algae, anything with a few spots you can treat with bleach, peroxide or excel baths depending on the species.

After the overhaul, get ferts and CO2 in right away. The root tabs aren't going to cut it with that relatively inert substrate (fluorite black sand? eco-complete?). Pull plenty of water changes in the first week; 50% every couple of days, dose with excel.

Don't forget to keep your filter clean during the restart.

-Philosophos
 

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High PO4 doesn't cause algae when it's in proper balance with other nutrients. I dose 1.5-2ppm PO4 a week plus what comes in through food, and I don't have algae problems. If I stop dosing PO4, I get GSA problems. This is a pretty common observance. Your problem is not enough nutrients, not too much.

-Philosophos
 
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