Hi Maryvonne,
The red seeds are probably immature. Usually the seeds are brown or black when ripe. They can be green with some species as well. I would suggest squeezing the rest of the seed out and looking for more mature seed.
Remember with Hardy waterlily seed that it can not dry out like tropical seed. Keep them on a wet paper towel while working with them.
You can peel away the outer parts of the pods now, they will not mature more once removed from the parent plant.
Cheers,
Sean