Gelato Week 1 Flower

Hi guys, I got this 1 Gelato plant in my tent that is not doing as well as the other 3.

Other ones are growing like crazy, no unhealthy leaves, while the gelato is growing much slower with signs of sick leaves. Conditions are pretty optimal in there. Using fox farm soil and products, but haven't given any of them a lot of nutrients at all because I dont want to overdo it with the nutrients.

What y'all think?

Wind burn? Just a guess

Hmm, I have just recently moved that one to the front bc it was in the back and the one that was in the front was getting too big and I couldn't reach the small one anymore. I will look into that possibility though. Thanks