Had concerns over damping off towards start of the week as seedlings tall leggy and leaning over, reduced light height to 8 inches and increased power to 60%. Last time I grew autos the light was a lot lower and whilst good yield nice smoke they were very bushy and short and stocky so experimenting a little with light height this time to increase spacing between nodes, 20 inches was way too far, being careful though as lights 450w, brill light spider farmer but gotta watch power a bit. The drop in light height and introduction of small fan making the plants wobble slightly has dramatically improved their strength and thankfully no damping off. Extraction fan on permanently set to 1 or two so low settings, nice air flow. Also sealed a couple light leaks so plants are getting their restorative darkness for 6 hours a day and overall touch wood looking fit and healthy. Pleased with the amount of growth after two weeks. Very light touch with nutes and watering at mo, .4 litre daily with root juice and bio heaven promote healthy organic soil. Fingers crossed so far so good. Happy growing all. :)