Do you know how old your rock is? Maybe its packed with no3 and is fueling you GHA.Just a thougt.But if you want to check your rock,take some out of the tank and put it in a container of clean salt water,let it sit for a while.Maybe for a day or over night.Then test the water in the container for no3.
Or just keep doing what your doing,eventualy with good maint. it should all come together.
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No matter how hard you try, you can't baptise cats.
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