I started with a 20g tank as well. Took about 3 weeks to get him to take his first meal with me. I had to Cover 3 sides of the tank. Had 2 hides, one hot one cold. UTH was 90 with thermostat. Ambient was good. Humidity was 45-50% No matter how i offered he wouldnt strike. I discovered i had to wait till he was in a hide and offer it at the entrance to the hide before he would strike. Its the only way he will take a meal. Some just have quirks you have to figure out. I also use a hair dryer to heat my rodents. 90 ish with IR gun and he hits them no questions (well as long as hes in his hide haha) GL on your feeding. Be patient and im sure hell start eating.