This was our Autoflower soil; lab tested, through multiple iterations, and finally ready for release. But that day, setup mattered more than brand. Step one: Build the wicking columns. Soil went into the corners first. Packed tight, not loose. Loose soil collapses when wet. Packed soil creates a solid wicking column. Optional, but powerful: Add a light wetting agent (Saponin source like quillaja, aloe, or soap nuts) Then I used: WDG3000 (1 tsp per gallon) A preventative for fungus gnat larvae. No infestation, just prevention. Gnats love moist reservoirs. Start clean, stay clean.