Are my danios supposed to do this

[ncstater1919]

is it normal for danios to twitch and stay at the bottem of the tank?

 

[Blade118]

ummm well mine go around all the tank



umm do they swim at all

 

[ncstater1919]

yea they eat and swim fine but i guess thats just there favorite place near the heater but i didnt no if it could have been a bigger problem