White Widow Autoflower - first grow

This was around the one month mark of the grow (my apologies for the lights being on for the photo). My tester plant was just starting to flower, but the 2 main pots were still in veg. Up to this point everything had gone well. My temps and humidity was where I wanted it to be and my feeding schedule was going well. At this point I was watering twice a week. One with PH water only and the second watering was with nutes (the general hydroponics trio with calmag) according to a schedule I found for autoflowers in coco. Looks to be about 1/2 strength compared to what is posted on the GH website. I started to see a few gnats so I sprinkled Diatomaceaous Earth on the day after a watering and it seemed to take care of them. No signs of any other pests. Growing is soooo easy right? LOL