Bruce Leyland-Jones
Fish Aficionado
'Will do okay' is, I believe, one of the reasons why so many fish are suffering at the hands of so many inexperienced fishkeepers.I believe a dario dario will do ok in a 3 gallon aquarium with proper treatment despite the claim above that they require a 10 gallon aquarium.
It may well be inconvenient, or an unpleasant reality, but these fish do have real requirements in which to thrive and 3 gallons isn't it.
Fish cannot be 'talked' into anything and, you are correct in this point, although the word you were after is moot.The thing is they also require live food (though with a lot of patience some can be talked into taking frozen food) and I suspect the poster is not in a position to care or feed for such a fish so it is likely mute.
Now we're getting somewhere, although it would take only a little more research to learn what 'thrive' actually does mean for fish. This topic has been covered many times in this forum.Anyway I think it is off topic to get into thrive vs live comfortably esp when it is not really clear what that means from the fish perspective. The real problem is keeping a 3 gallon aquarium stable for any small fish is more difficult since many of them are not robust to poor water quality.
The point about the instability of smaller aquariums is well made.