Since I think no one has mentioned this, males do sometimes 'breed' with other males in a display of dominance. So you may actually have two males 'holding tails'. In this case, I am fairly sure you will have one stop feeding eventually. Have you had them sexed?
Also, did the breeder tell you to keep them together permanently or just during breeding season? All big breeders I know of keep all of their snakes in seperate enclosures. Keeping males and females together year round can lead to loss of interest in mating with each other (aside from dominance issues, feeding problems, etc.).
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