That's realy not necessary as some will sink some will not.
You still have some of the outer shell on the ones floating. But i can tell you that because seed floats
doesn't make it unviable.

These germinate in a month or two after sowing normally.I put them in a baggy with peat perilite mix and squeeze all excess water out of bag. Then I put them on the water heater covered with a towel and wait.

Thanks guys. So two more follow-ups....one, does it matter if the seeds are peeled or not prior to planting, and two, once the seed DOES germinate, is it a relatively fast grower? (Obviously I'm not expecting a tree any time soon; I just mean in terms of a growing plant.)

It will grow two or three fronds a year when young and then they get faster.Here they will be 3 ft overall in a few years.After you soak them and then let them dry one day the outer seed coat will come off easy.It will just crumble off the seed. Email me if they don't germinate and Ill see if I can help you find more.