First Grow (Indoor/Outdoor) Blue Haze F

This week started great but quickly turned bad. I noticed the plant started to show that something is wrong. The 2nd set of bottom leafs started to turn slightly yellow, plant started wilting. I also noticed stunned growth. I was sure it was not too much or too little water. The plant was not over watered, also the soil was not dry. I was also sure it was not the lack of nutrients or wrong pH as I was feeding nutrients last week and balanced my pH. The only other thing would be to check if its root bound. All the symptoms of root bound were showing but I didn't at first think that it would already be root bound as I replanted about 10 days ago. I decided to take a peek. So I took it out of its container and I couldn't believe how root bound this plant is! I replanted it into a 4 gallon container and used Fox Farm soil. After a few days it started to improve and is now looking good again.