Heptane is a bit more selective, meaning that a lot of impurities that naphtha would dissolve get left behind....
However, i have had great success just using naphtha...so no, you don't have to use heptane.
I do suggest doing a room temp recrystalization with naphtha. Because it takes longer to evap than bestine, you can grow even larger xtals with it. Just put a lid covering most of the jar (leave some space though!) and leave it in a non dusty, vibration free area and wait 2-3 days tops. You'll have massive clusters of xtals growing!
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