Anyone mind providing me with some ASF info..

Kinda clueless...other than they are a different species of rat?

I have a picky eater whos only eaten once since I ve had him about 2 months now...he ate a live rat for me about 3.5 weeks after I got him.
the breeder was feeding him live and pre killed
husbandry is spot on.....60% humidity, cool spot 78-80...ambient 78-82, hot spot 90...hes in a T8, clean water every 3 days, mist the enclosure as needed,

I was thinking of trying pre killed next or maybe looking into ASFs.....
ive been monitoring his weight...he was 691g after previous meal and before pooping...he is 675g now..after a good poop about 1.5 weeks ago

Any advice would be great!

Thanks