Now based from this pic, unless the poor guy is being quarantined for transfer, you seem to have a very tiny bowl with a betta in it. he does look like he has had a fresh water change recently though so that makes me a bit happy. But you could create a divider and put one boy on each side. It does look like a ten gallon which is fine to split two or even three way.
Feel free to message me any questions, I'll try to help the best I can!
Rummy- Mini Rex Rabbit
Diz jr- Betta
Yoshi- Crested Gecko