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-Fish - Molly -Tank has been set up for over a year -Nitrates etc, no idea -I change 25% of the water every month after leaving the water for a week to dechlorinate. -I have a 10 gallon pump running a 4" air stone in a 10 gallon tank with a filter that is separate

The video is working from my wifes phone, not sure whats up. It is most definitely a sex pest male fish 😀 I assumed water parameters but there are 15 other fish that seem fine.

Any ideas why a fish would do this, it is concerning me as it's just sitting on the bottom most of the day and appears to be flapping its fin a lot to do nothing. Video of fish