My biggest mistake was putting a fan too close to day-old seedlings. I read for a couple of hours, then looked back at the cubes and the seedlings fallen over, never to rise again. $10 bucks and 50% of my planned grow. Then tried quickly to replace those two by popping some bag seeds…but they never germinated. Three weeks later I accepted I was going to have a 2-plant grow.
NOTE: And while it's annoying, I'm just out $10 on seeds and will have a light harvest. Not a whole lot to complain about since I grow for personal use only.