I would recommend against putting anything in there for a while, since it'll release ammonia for a while.
Here's what a guy on another forum told me:
You can put it in a big bowl or tub, wet it really well. Let it sit for a few hours and scoop out the big floaters. Do this over and over a few times then let the soil dry a bit. Wet it again the next day, let it dry a bit more and wet one more time to dry a bit. It will take about a week if you put it outside to dry quick but by the time you do this it will be absolutely fine with little floaters by the time you are done. I did this and then mixed in half and half soil/floramax that I had left over and it's working out fine.