Thinking of a planted tank for my discus upgrade, and see if I can get the plants to do most of the filtration. Inspired by Dr Walstad's book, I have been considering this: 1 inch of compost, making sure it is vegetable compost. I'm sure I can find "vegan" compost or something like that garden netting over the compost. This will allow the plants' roots through, but it will stop cories from digging up the compost and keep the layers separate 1 inch of sand. Wood, rocks and the like would be placed on the netting and sand placed around them. Plants would be placed on the netting and kept in place by the sand layer until they root themselves properly Opinions? Suggestions? Anyone already tried something like this?