You are correct in your assumptions (N. eggersi male)which I assume to be Eggersi Redd???
Should be depending on humidity and dampness of peat. Although it has been reported that annual eggs can be kept well past their normal due hatching date, I wouldn't leave it more than a month or two past to wet the peat.will still be fine when I'm ready to put 'em in water.
just out of interest here Ludwig, what is your secondary foods for feeding after BS. Nothos like copious amounts of Livefood.
Regards
C