First ever grow autoflower

Thanks for recommendations, I have changed the light schedule to 20 hours light and 4 hours darkness, and also changed the water to 6.2 PH. I've also added BioBizz Grow 1ml per litre. I am going to feed them less as per the recommendations to once every 5 days or so or until the soil is dry. Im awaiting delivery of a new grow tent and rather than use the wardrobe, with an extractor fan for better air circulation. I have been having problems with the temperature, went up to 28.2c at one point and humidity up to 84 percent. Have since managed to bring it down back to 60 percent, waiting for a dehumidifier to be delivered.