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did you test the PH after you cured it ?
what did you use in your formula for the arogrocrete ?
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I have a Ph monitor and the Ph is stable around 8.0. I used ph down when I was curing the rock to speed the process. When i added the fish after 6 weeks (10 weeks total) the Ph had stablized.
I used 1 part concrete, 3 parts oyster shells, 1 part aragonite sand and 1 part crushed coral. I did use play sand as a mold but I washed all of the sand off.
I did leave the two overflow casings on for now, but I did replace a heap of aragocrete!
I'm with Bob...I did some major water changes and that helped a bit for a short while.