+1 In my experience less than half of t's will take worms, many will not. I also would try crickets. At that size I would expect it to not go 2 months, but if it has a large abdomen it shouldn't be a worry. Do you have a pic?They like crickets, have you tried them?
I have multiples of 6 species of Avics, and they're all good eaters. None of them are on the substrate. In my experience, an Avic that's not eating, and not in an upper part of the cage, needs a better set up or it won't last long.I only have two Avic sp. so I am by no means an expert on the genus, but it's rare for mine to refuse food for extended periods of time.