Four things off bat, you know of the first, I really would recommend changing the Zilla for a Reptisun 10.0. Second the dragons need to get 6-8 inches from the UV source and still bask. Third the basking needs to be monitored with a digital w/ probe thermometer. The range should be 105-110°F for young dragons. Lastly the red light should be switched out for a clear colored bulb, you can use a house hold bulb that is either vivid white or natural daylight in color, or a reptile basking bulb, there are other option too if you need. The reason for this is dragons can see red and it may be the issue with this young one.
I hope everything works out here and if you need more help please ask. :wink:
I just want the best experience for you and your dragons, I want you to have the longest time together as possible, they are great pets.