A six year old 1400 gram male will eat on his schedule, not yours. I have a 2000 gram male about that age that last ate for me the weekend before Halloween. Even when he is eating he takes a small rat every two weeks.
Also, you keep mentioning "feeding tub". Feed him in his enclosure where he feels comfortable. A picky eater will be further put off by being handled right before you offer a feeder. Also try offering in the late evening when he would normally be active.
And yes, if he ate 4-5 days ago it's way too soon to try again.
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