With phosphates at 2.4 I would recommend frequent water changes and some Foz Down. The Foz Down will be able to cost effectively and easily remove the Phosphates and keep new phosphate under control while the rocks finish leaching.
I would recommend reducing phosphate over a period of 2 weeks. 1 $30 bottle of Foz Down should remove all the Phosphate plus more. No need to remove rock and disturb your tank again.
FYI I produce the Foz Down and lots of people here have used it successfully.
Cheers,
Tim
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