In clay balls, you should be running hydro nutes. I use Canna. That's a true hydropponic medium, and your life will be easier if you set it up as flood and drain because hand-watering clay balls is a bitch! That's 6 flood cycles per 24 hours to get the moisture about right.
If your grow room is quite cool still, leave your heating pad on. I forgot it is winter in your area :stoned: