HI Amy =)
What temps are you keeping Hakkar at? Sometime's lack of right belly heat will cause a BP not to digest his/her food right, in result to not being able to digest their food will cause it to rot in their tummy. Which is not goodIF you have your BP at the right temps ( belly and ambient ) than an answer has been previously elaborated to you by a peer. IF your temps are off than it will cause your BP to either not digest his/her food or take longer to digest.
I feed my collection and 4-5 days later they all poop like clock work every week, so.. I have a full time job it seems cleaning for those two days after work. I keep my BPs in the racks at 86 and ambient house temp is always 78-80