This may not be the right category for this post, but since my question is more chemistry based i decided to post it here.
I've decided to try my hand at do it yourself live rock. Rather than just doing the standard brick method I made a pretty elaborate sculpture an abstract thing with lots of folds and shelves, vaguely Lovecraftain. Anyway I've made a mold of it and I'm getting ready to cast it.
When i started researching this a while back the ingredients for the reef were Aragonite, Portland cement, oystershells, and rock salt[the rock salt is supposed to help with make it more porous]. The guy at the reef store told me that I shouldn't use oysters because they release potassium as they break down.
What should I use for gravel in this 'concrete' mix. Also since some of the "shelves" are probably thinner than they should be I was thing that I should add something to the mix to strengthen it like pvc shavings or such.
So my question to you smart chemistry type people out there is what should I use to make up the "live stone"
Thanks,
Neil.
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