Fuzzies (5 to 7 grams and under 10 days old) are too small for a 145 grams hognose at that size he can eat hoppers (7 to 13 grams 15 to 20 days old), a prey too small might not be worth the work for him.
I would still downsize to 10 gallons for a male which is standard (20 are generally used for females.) , while a 20 gallons can work when you have feeding issues it can be one of the contributing problem, especially going from tub to glass tank.
Most importantly wait it out, it's a big male he can go months without food and as I mentioned he is sexually mature so usually food is not high on his priority list.
This time of the year their instincts tell them it is time to brumate and than breed so I would say you can be looking at next February or even spring before he resume feeding.
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