Temps. a little high as the fan has broken Humidity is only 10-20% is this going to cause me big probs? Should I get a humidifier in there?

Im not sure about nutrients, I have Forumulex should I put a 1/4 mixture into the water for the plants to suck up too?
KHAN Reviewed by KHAN on . First Grow - Ice 2000 - Advice Welcome Ok having read up i'm starting my first grow, 12 Ice planets in a NFT hydroponics growtent. First up, here's the setup ;) Rating: 5