I didn't vote, because my option isn't up there. I say leave them in if your lazy, or take them out if you feel like it, both work.
The seeds can hold water inside them, which can
( but not always) throw off the water content in the jars. This is why some people say to remove them. I have done all the above, removed them all, removed most of them, and not bothered to remove any at all. It all worked for me.
If you leave them in, drain it really well, and maybe toss a tablespoon or two of dry vermiculite in the bottom of each jar before you load the jars to soak up any xtra water and it should be good to go!
Edited by TurkeyRanch, 21 November 2014 - 07:10 PM.