Pineapple Chamber

Week 5 came and with it brought repotting. I purchased an Autopot system with reservoir and placed four of the girls into the 20L containers it came with. Their water tank is a 50L reservoir with an air stone and pump inside. They are all in a 50/50 coco perlite blend. This week I also started up the other light and spaced the plants out as you can see, they are beginning to get thirstier and growth is becoming exponential. Can you spot what is wrong with this picture? I couldn't - but in a week something came to light! Let me know if you figured it out before I tell you 😅