If you put them all in at sizes you listed, the bass will have wiped out the FHM just in time to start on new hatch BG that manage a spawn. I know it would be a big mistake to stock crappie at all in a pond this size. They've got to be controlled by more than just angling, they can take over quick. Not saying it can't be done, but it's really hard to undo once you make that move.
If Fall doesn't work for Bass, I would recommend waiting a year to let your forage grow. If all stocked together I think they will all suffer to some extent. The forage base has got to be sufficient to support proper growth from day 1.
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