yes.. some people say that betta's can live in a small container - yes they can but they will get depressed. betta's have different personality too just like humans. if I were you, I won't go under 1 gallon and make sure he has some hiding places to hide like plants or ornaments.
The Marina Betta keeper isn't too bad for a single Betta as long as the substrate on the bottom is no more than a centimeter high and only one piece of decoration.
The problem with tanks that are smaller than 2 gallons is trying to heat them. Also, in my opinion anything smaller than 1 gallon would need daily water changes.
Heating them can be a problem with small containers unless you use an extra mini small under-the-substrate heater pad (most of the time these have to be placed under the tank out of it on a heat-safe surface). By this point it isn't worth the time and effort so most people with small tanks go without a heater, especially if the Betta is on a desk near a lamp. Yes, not the most healthy environment, but Bettas are very adaptable fish. Truthfully, my Luma didn't have a heater for a while in his 2.5g until a few days ago when I decided he was staying too cold on my coffee table. Now he's a super happy fish.
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