Help

My betta has been fine for the past 5 months in his tank along with 2 albino corys. but yesterday i added a female in a cup to introduce them and i left her all night. This morning his fins were all split and im not certain why[emoji22]

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Has he been in any contact with the female?

Just through seeing her in the cup, i was told he could of flared too much or bit himself over anxiety

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Hi, Yes he will have shredded himself probably due to excitement/anxiety as you say, is this a breeding attempt? if so bettas need to be conditioned for a couple of weeks before attempting to breed so they need to be fed live foods, it is not so easy to just introduce a pair and hope they breed unfortunately, do you know what to do with the resulting fry? if it is not for breeding males and females should not be mixed.