Sour Diesel Autoflowering (1st grow)

This is my very first grow, and decided to go with an autoflower for its fast growth and ease of care, and Sour Diesel for the high sativa percentage. Bought the seeds from ilgm.com because of their good reputation. I mixed the plant medium, then soaked with water to prevent hot spots. Let it drain through the fabric bag for 5 hours and checked pH (7). Planted 3 seeds directly in soil so as not to stress the plant, and put in a small greenhouse on my porch to germinate. On the second day, mixed a granule of citric acid with 1/8 t muric acid with a gallon of water, bringing the water pH to 6.3. Sprinkled only about 1/2 cup on each seed. On third day, two of the seeds sprouted. I nervously removed a stuck seed husk from one seedling. Side note: I had planned to grow these in my attic but we have had very high temperatures recently, and I am unable to keep the area cool enough. I may bring indoors if I can work out a cooling method that isn’t too expensive.