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One of my bronze Cories has been swimming along side the other, then getting on top
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well i would first like to say that i am happy for your C. Aenus! Cories are extremely social fish and only show aggression to one another under EXTREME conditions(horrible overcrowding). Bronze Corydoras are very easy to start a spawning ritual. They do exactly what your saying, and then if the conditions are right they will slow down, make their classic T-formation, start head buzzing, and initiate spawning! Keep your water conditions good and keep on eye out on broad leaved plants and your glass for little transparent balls. They are eggs. If you have a pleco in the tank chances are very slim you will find eggs though
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or are the 'love nibbles'
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not quite.

He is actually rubbling his barbels(whiskers) and mouth parts on her head to help trigger her spawning. Cories spawning has to do a lot with the mouth part of the female. Since Corydoras don't have teeth you wont have to worry about biting. He wouldn't hurt is partner anyway since cories are so gentle!
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If one of them is a little plumper than the other, it could very well be mating.
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Shes right, the fatter looking one will assuredly be the female. The plumpness coud mean eggs, or your keeping them well fed!
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Cories are very fascinating to me in their actions
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Your right! i could right a book on these little guys! I love them to death( the name and signature doesn't give that away!