I mist the tank once when lights come on and once more when lights go off. Also wrap the top with cling film and leave a small opening at the top. 10-12 is generally the average time to have lights on. Ive not heard of Dennerle before so wouldn't be able to give advice on nutrients so hopefully someone can give you a bit more info on that. Glad the guide helped Dry start method is very good for getting carpet plants to root such as HC etc.