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how would you tell if bronze cory etc eggs are infertile or not? and what should i do to get rid of the infertile eggs, because im thinking it would be very difficult to remove the infertile 1's because of how adhesive they are. and would fungus attack fertile eggs too?

Fertile Corydoras eggs tend to go a tan sort of colour. After a few days you can just about make out the embryo developing inside (if you screw up your eyes/use a magnifying glass)


Infertile eggs tend to go/remain white and have fuzz growing on them.. You can see four dead ones in the group below.



I tend to just let nature take its course but I'm sure that, with a steady hand, it will be possible to separate the good eggs from any bad ones without damaging the good ones.

The eggs in the pics above are from C. paleatus, but the story is much the same for C. aeneus.

Hope that helps,
Martin

thanks martin! this would really help in the future because i plan to breed corys!