How has your grow been going?
I would use a fan, but I am not sure about the rest everything I have been doing so far is trial and error.
i got a t5 lightwave ims etting up tommoz now mate 96watts very good lights apperently gunna stick it in my big cupboard and my seed is auto flowering ak47 cross with white widow be good yield in a big cupboard ?? and should i have a fan blowing ????????
The first thing I would look at is with a 400 watt light you will want approx 4'x4'x6' space, otherwise you may burn the pants. As for the nutrients the best thing to do is look at the feed chart for nutrient company that you are using. When starting from seeds or clones do not use fertilizers. Now on to your tank, that will be based on the number of plants you will be feeding, but just keep in mind the your nutrients are done per the gallon and based on your grow system.
my firsy ever grow im really new to it all to be honest im gunna set up in my cupboard 400w hps and one auto pot and a fan blowing is that okay how much nutrients do i add to a 47litre tank ? and when should i add the nutrients to the tank ??