Controlling your climate is just as important as getting your nutrients right if not more important.
Temperature – with my Grow Light on and osculating fan off my tent will get to a maximum of 27° Celsius and at night was dropping to 16°. To fix this I got a space heater that will maintain room temperature at 22° even at night. This is a common growing method used to reduce stretching and will also prevent hot/cold shock further into flower.
Humidity – this will sit around 27% with no other controls in place and I like to keep it around this level for flowering. During early development and the vegetative stage a humidifier is turned on for 40 min periods every 2 hours throughout the day. This keeps the humidity around 65% which is more ideal before entering flowering.