Like john said with respect to the FHM's...IMO, a dead minnow, give or take, a day for a few days would not surprise me. Once the FHM's get to be adults you can see dead males occasionally that have exhausted themselves breeding and guarding nests (so long as you have breeding structure for them I the pond).
The BG should do just fine. I stocked over 600 fish in my pond last April (500 of which were HBG)and may have found 10 floaters within the following week or so. With only 35 fish, I'd start wondering what was going on if I started seeing more than a couple floaters.