hold on I had a beta for about two years in a fish bowl about 1 gallon and fed it once a week
Live plants can help too. But I doubt you want to do the walsdat Method.
Well that death was inevitable.
Wait it's alive, probably a pecking order establishing... he's swimming a bit, but he just went and slept on top of the plant.
Can we see a pic if the tank? Hopefully they're females.
And I wanna try the walstad method in a one gallon! Lol. Get a little light, some dirt, maybe even a little CO2. And for livestock, A shrimp, for that is all a one gallon can hold!
And test kits are like the most essential part of the hobby...