[Canadian Man]

Originally Posted by Rasta

I built a " wall " around the back and sides of my tank using aragrocrete and built some rocks too

My formula was 1 part argonite / 3 parts crushed oyster shell / 1 part portland cement & about ( give or take ) 1 part water

For the " wall " I poured this mixture on a piece of eggcrate with plastic vapour barrier under the eggcrate on my basement floor ... then cured it in a kids wading pool ... the curing took forever

For the rocks I did much the same as you as far as the forming them and so on ... the testing of the PH and frequent water changes is key IMO

Cheers

I recently make a whole bunch as well and used roughly the same recipie as Rasta.
Oyseter shells makes it nice and porus!