Double fertilization

[JP100]

Hi
I was woundering if it is possible for a female to be fertilized by two different males at the same time? And im assuming its possible for a male to fertilize more than one female.
Just curious as my last lot of babies was a mix up as the two females and males decided they would play free willy and jump my divider and they got mixed up. I ended up having both females lay eggs but I have no idea who the father is.

 

[Jossie]

I'm going to say no.
Seeing as they 'choose' which sperm packages they take, I doubt they store sperm or exhibit cryptic choice.
The only way you are going to be able to tell is by the colouration.