When should i start worrying?

So my male BP has not eaten for the past 10 weeks. He has done this last year and started eating again, but this time it seems like he is loosing more weight. He was originally 1233 grams and now he is now 1136 so he has lost about 8% of his body weight and im worried because he would not even take a live rat when i put it in his tank. in fact, it looked like the rat was more interested in eating him so i separated them! Is it still too early to be worrying? What else could i try?

If she drinks and pee he should be fine... My male dont eat from end of January he was 1217 now he is 1103 but He shed recently and is moe active so I will try offer food today.. I for purpose dont offer food last 3 weeks and will try live weaned rat now (40-45g) range... this size of rodent should be safe to leave over for couple hours (will supervision of course) if he don take it... wait 2 weeks and try again... So Far In my opinon there is no reason to be worried ... at least Yet.