It is a beautiful tank.
Having said that, I have a Betta in a 10 Gallon, alone.
and another in a 2.1 Gallon Critter keeper also alone.
Both are happy, swimming all day into gentle currents.
Eating every bit of food in the tanks morning and night.
I'd like to put the critter keeper back as plant only, and get another larger tank for the 2nd betta, but He's just as active and healthy as the one in the 10 Gallon.
Also their names are Finn and Sawyer.
But to return, Try and keep it clean guys no need to force opinions one way or the other. I'd hate to see this get locked up by the mods.