I have been working with termites for almost 10 years. Ed is right, humidity (or lack thereof) is the number one issue. Heat is the next. Finally, having secondary reproductives is great, but you are unlikely to have gotten a queen with your colony. The colony will make another queen eventually, but they need to be very comfortable to do so. And, they need time. My recommendation: get a 10g, get a glass top and find a very quiet and cool place to situate it. Set it up with sandy, sterilized soil in the bottom, and pieces of wood above that. At least some of the wood should be old and waterlogged, and should have some of native soil and pieces of wood from where the termites originated. Mist occasionally and dont mess with it for 6 mos. If you can see juvies, congratulations, you have a queen. Now, you can remove some (SOME! like, less than 50) every two to four weeks. Termites do NOT like being disturbed, and my experience has been that they need a 'critical mass' in a colony before you can feed from it consistently.
Good luck!
DG