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Focus on the source rather than removal. Phosphate is either coming from your water/food or it is coming from established "trapped" positions. Most people thaw/soak their frozen foods in RO/DI to leach some phosphate out. Also please commone on how much you feed.
Most new tanks also have cyano/junk on the sandbed. Do you stir the sand bed to make it look "clean?" Stirring the sand is a huge no-no and releases tons of junk into the water... this could be the source of the problem. Don't give up. You also didn't comment on how long your tank has been running. Most people will say at a certain point algae/cyano just eventually goes away (as long as you are taking appropriate preventative measures) as part of the tank cycle.
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