Hey you can get everything u need for your purpose at Amazon or Ebay. That 400 watt light is too much for a small closet please learn a bit more about fertilizer - P H and the growing environment u need to create buy Marijuana Horticulture the indoor outdoor Medical Growers Bible author Jorge...
They have to and the look strong and they can take a lot of abuse only thing is it sets them back for a few days to a week or more depending on how bad they were also remember that plant foods change the ph also salts build up in the soil so Vostok suggested flushing and he is absolutely right...