tufa and lots of it

[rossb]

did you test the PH after you cured it ?

what did you use in your formula for the arogrocrete ?

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.