2.2gal walstad tank for betta

i have a 2.2 gal tank left over after upgrading to a 10 gal low tech planted tank. my betta is agressive to his tank mate and isnt a strong enough swimmer with the marineland penguin 100 hob power filter. i want to set up this extra tank to be a forever home for my betta. ive never done a walstad tank before and i wanna do it right. any plant suggestions? any tips or tricks? recommendations? i will still run a itty bitty hob filter on the tank but it doesnt realistically do much for filtration. just helps keep water from being stagnant. is this project realistic?

 

I wouldn’t do a betta in 2.2 gallons, what’s the footprint?

 

im aware its not ideal but he was happier in there. he gets thrown around in the new tank and isnt quick enough to eat properly. whats a footprint?

 

Dimensions of the base of the tank

 

11x6x10 approx


this is what it looked like before i upgraded to the 10gal. i inherited the 2.2 gal tank from my mom with the fish already in it (betta and oto cat).