Okay so the first 2 pic's while not 1 gal are smaller but I have been using it to grow baby betta's from petco, and i am on my second one. once the baby is less shy, eating well, and grows a little I move to a 1 gal.
Before I was just using it for extra plant clippings. I change the water 100% daily but i don't scrub off the algae. This is in no way a permanent home.
this next one is a 1 gal which my blue gal is living in until i get the sorority up and running.
I change water 75% everyother day.
all my betta tanks are bare bottom right now until i get some eco sub strate or soil.