I have a 3G w/ 2 danios now..I since learned this is way too small & they are happier with
at least 4 more to school with.
I bought a 10G now I'm waiting to cycle (fishless w/ fish food method).
So will it be Ok to put 6 danios in with a female betta?
Females don't mind currents as much as males, correct? The Aqueon filter is pretty brisk
even when filled max. But I'd give her lots of plants & hiding places.
I feel bad for those bettas stuck in tiny cups & want to save one.

Will they attack her fins or visa versa?
I'd have the 3G running still as back up is this happened.
Also, what heater do you recommend for a 3-5G?