I’m not disputing or arguing, just asked a question because over the years Ive seen these fish confined to miniscule containers and have often wondered do they place them in tanks at night and re package them in the morning or what?
They would stay in the little “cups.” Bettas aren’t terribly successful in larger tanks.
Betas are confined in separate containers because they’re fighting fish and they’ll kill one another if they’re together. We had one and he’d even attack his own reflection.
They don’t put them in tanks at night because it would take an entire room to do so (in order to keep them apart).