The Nothos do need a dry period.
I know of no instances where they have water hatched, not for me any way.
Caserole use to dry his for 2 mths before rewetting.
I've not heard of killies changing sex once coloured up, although there is a species that is hatched all one sex and needs a hormone given of from urinating female mammals that pee in the fish's water.
NZKA #1 has a face slapping experience about that species.
I prefer to spawn the fish in a BBT with a pot like Wok describes, Caserole does the same but has gravel on the bottom to capture eggs laid out of the pot.
The base can have spagnum moss over it as a base for them to spawn in as well.
This really doesn't make sense, not to me anyway.
Or if after reading it again, is it that you have two males AND some (??) females?
Where did you obtain them from and what ratio are they: males to females??
Then further down you say that you have three males and eight females??
How long have you had the for and could you post a pic of them please.
Just want to confirm if they are the species you are referring to.
What were the species of eggs that you obtained. If I know that I can possibly help you.
And the answer is yes, you can hatch them after a long storage, numbers may be down tho dependant on the species. If the medium has dried out completely over that time, I doubt if you will have success with any hatching tho.
Did the previous owner leave a note with the eggs, it should have the date stored, the date expected to rewet, and most important, the specie of fish.
Hope this helps, and answers to the above will clear up the ambiguity of the posts, well, to me anyway.
Alan 104