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Corydoras egg infertility


Simian

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My C Sterbai spawn but the eggs are all infertile. its only a small group 2 male 2 F so I'd expect a large amount of infertile eggs but some should take.

Has anyone had any experience with this? is it something they get better at?

I have read that reducing the ph aids the sperms penetration of the egg, I'm sitting at 7 atm but as they are SA fish I can comfortably drop the PH by a point or two

My Caudimaculatus have about a 75% fertility rate and my Trilineatus about 50% in similar water conditions.

Any comments?

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