Yes, I'll get some photos tomorrow. PO4 was very low before the algae problem, so not likely the issue of it adsorbing/hiding it. Sand is mostly gone, rock is under 2 years old, all fresh Walt Smith rock when new.
I did have lots of food and fish deaths late last year, which I'm sure permeated the rock with nutrients, but with the amount of water I change, it should be manageable.
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Brad
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