There has been some slight change over night, although nothing drastic. I'm assuming these things need many many hours instead of just a few like the instructions suggest. Perhaps I am just daft.
19 hours into it and there is a definable mound of growth on the stone on the right and the stone on the left isn't far behind. I need to find a small tool to measure the height with? The box claimed I think 1-3 cm, but I am not sure offhand what that would be in 'merican.
We'll see how the day goes. Does light have any affect on them, I wonder? It's definitely green crystals we're looking at.