Is this a macro alga with some structure, or a brown film? In either case, I might try some GFO as a first step. Sometimes, that helps, even when the phosphate measures zero. Other approaches that are easy include vinegar and vodka dosing, or some chemical approaches.
Please post clear pictures of this algae..
If you have LEDs turning the blue channel of your lights off or way down can drastically increase color rendition and even allow your camera to focus better..
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