Niko, Thanks for this 'valuable' post and the link to the set up sequence. I saw the photos of this event on the DFWAPC web site but they didn't seem so extensive. The information on the substrate construction is very helpful. I am determined to get away from those two bags of Flourite that are sitting beside my office desk glaring at me and have been reading up on substrates, Art's articles and others on APC. Your post is timely.
Question: What is the dry bacteria additive used in the substrate? Does it have a brand name or source?
You've used a number of substrates, from Flourite to garnet sand (and more?). Do you notice anything special about this set up in terms of plant growth? or?....