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The GFO only removes the P that's in the water. The algae that's growing on the liverock can get it there. There are many cases where there is very little P in the water, yet the algae continues to grow well. Consider a tank full of hair algae, or one with a thriving refugium, very often they have undetectable nutrient levels. Same with a real reef, the water is barren of nutrients, yet life thrives. If it were not for all the grazers, the reef would be overwhelmed with algae.
IMO algae are greatly responsible for the initial cycle in an aquarium.
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