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IMO the P in the rocks is not just sitting there ready to cause problems. That is bound to the rock. It's the very nature of the rock to contain P. It was live once after all. Bacteria and the algae's rhizomes can liberate it for their use.
Alo IMO it's not the P contained within the rock that causes the algae bloom in a new tank. Rather the nutrients from die off. Not only what was on the rock when it was put in, but also the bacterial bloom that happens. Usually there is an overpopulation of bacteria, some die as the the population has to reach equalibrium with the nutrients.
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