I have tried making aragocrete and one problem I ran into is that the rock is leaching a lot of silicates into the tank which drives diatom blooming. How long it will take to get rid of the silicates I do not know. I suspect that with different cement you could reduce that problem somewhat? Anyway I pulled that rock out once I figured out what was happening and am still soaking it, maybe in a few months the silicate leaching will calm down.
At Garf they just drive the tank straight through the diatom bloom and they are displaced by green algae. But I get the feeling that some cement releases more silicate than others..?
BTW, I just used aragonite sand and cement so the problem is not from a regular silica sand in the mix.
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