Put this together the other afternoon in a SuperFish 30cm cube I had knocking around the garage. It might change, I won't be planting it for a few days yet. Not sure if it's wholly appropriate to post this in journals 'cause I'm not sure if it's going to turn out to be much of a keeper, but hey... There's a layer of soil under the sand, a 1:1 mix of peat and ericaceous compost and I'm going to be using CO2, so it'll be a fuel injected soil tank. Haven't given much thought to plants just yet, or for that matter where I'm going to put them - the hardscape is a bit overwhelming - but I have some loose ideas.