I have a killerbee yellowbelly that is going on 20 weeks off feed. His weight before his fast had gotten to 569 grams. He is now sitting at 495 grams. I know husbandry is going to be the first thing mentioned. He is in the exact same set up as my other 3 balls and he is the only one not eating. I have plexi tanks, 83-84 ambient 89-90 for the hot hide. coconut husk bedding, everything on thermostat and monitored by thermometers. My question is is it time to "assist" feed or do I continue to wait? What is considered too much weight for them to lose? Also his last couple meals were rats. I have since tried rats and mice and all live, pre-killed and F/T. Every now and then he will strike at one but never coils. Don't know if this is BP stubbornness, his spider wobble causing a problem or something else that I can't see. His behavior otherwise seems normal. He roams the cage at night, switches between his hot and cool hides and is drinking as evidenced by the fact I still find urates in his enclosure. His last shed also went with no problems. Recommendations????

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