I went crazy trying to find the big vermiculite and perlite and found some on line at a gardening supply webpage. And now that I'm getting close to needing it I think I might go substrata less. You might consider looking into this method.

1.1 pastels, 1.0 lesser, 0.1 het blurry, 0.1 spider, 1.1 norm. 0.1 dinker,