Reverse will work. Do it now, as I wouldn't want to spray past week 3 and you have to spray twice in intervals of 10 days. Make sure you use saturator at 10ml/l only!
I use a nute chiller and keep the rez at 64F and tank bubbler. High rez temps breed nasties. Use 3ml of 30% H2O2 per gallon of rez, every other day. It increases O2 to the plants and will help keep you out of trouble. I have a custom system I built myself, and I give them the 3ml/gal in every...