Hes probably still acclimating and stressed. He may not take food for a few days up to weeks but this is normal so don't worry. Bass can go a long time with out eating.
I had a group of three once, and all I could get them to eat was fathead minnows and other feeders....plus they didn't really take to my higher temps. So I put them in my garden pond....yeah, so now I have 122335467567856789 bass haha. Good looking tank and bass.