I set up a 10 gallon 2 weeks ago with an inch of Miracle Grow Natures Care Garden Soil and capped it with an inch and a half of 2-3mm gravel. I air dried the soil first and sifted it through a window screen before wetting, capping, and filling the tank. I have kept a heater and air stone running and covered the whole thing with black plastic to block light. No stirring…just soaking the soil and doing a weekly water change. This is the second water change so far. Lots of tannins!!! I’m thinking a couple more weeks before I add plants.