hey guys looking for some help.

my red tail boa has not eaten in a month and a half. he is not losing any weight from what i can tell but im still getting a little worried. his enclosure is dialed in. heat and humidity are good ( humidity is 60, hot side is 90 and cool side is 80). ive tried feeding him f/t, brained, scented with broth, pre killed, live.......im kinda running out ideas.

does anyone have any words of advice, please?