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I want to ask whether this is normal behavior? I haven’t seen the male danio fish stop chasing the female ever since I had purchased them from the store. I walk away and walk back and he is still chasing. It seems a little... tiring.
Danios are social fish, so just putting 2 in a tank they will not show normal behavior. Aggression is typical of schooling fish when they arent kept in sufficient numbers.
From your post history, you are doing a fish in cycle? How is that going? Do you know your water parameters?