My (wrong) thoughts also. I tried doing that, but the algae continued. The PO4 accumulation also inhibits coral calcification, which I did notice as well. Denitrification does continue (it is not a function of the media composition, only size) although the 4" inches recommended by Dr. Ron isn't required. The aragamax bag actually says only 1" required, and I have found this to be true. In fact, a tank with the proper amount of quality porous rock should have 0 nitrates.
I believe that most people will need to remove their sand when it hits the 4year range. This should also be a consideration when purchasing used sand. The bad stuff comes with it!!
What i did was remove all my sand, and I added 2 bags of new sand. I am so far please with the results. I have a large selection of sand fauna, 0 nitrates, and the tank is now 3 inches deeper than it used to be.
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Brad
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