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How can i reproduce corydoras nijsseni?

I have a couple (in an aquarium with 70 l). The female has big belly but she doesnt want to lay down eggs. When i change the water, a courtship occurs, but she doesnt lay down her eggs

I would put the pair into a smaller tank and make daily water changes and use water that is a few degrees cooler than the water you take out

Do you live in the same part of Brazil where C. nijsseni are found?

Ian

Thanks for your message. I found the couple in a fish store and they were mixed among C. imitador. I live in São Paulo- Brazil and the Corydoras of the region are C. kronei and C. nateri.
See you soon.