Yes you should definitely move your fish. Just be sure the water in the tank is the same temperature as in the bowl when you actually move him. And adding some additional decorations/plants/caves to the larger tank will make him feel secure. Most bettas will appreciate a larger space.

The only risk of drowning is if your fish can't get to the surface at all for air, since bettas can get oxygen both from the water through their gills and from the air using a specialized organ. They do need access to the surface, but unless your fish is ill or weak, no tank should be too big for him/her to swim up for air.

 

The tank is probably better for him... unless there are other fish in the tank who might not get along with him. Will he be living with other fish in the tank?

 

alright thanks I'll move him, and nope he's gonna be in the tank by himself

 

For sure move him. Bowls aren't good for bettas

 

Tank would definitely be better. More room and it will also allow you to heat and filter his water if you can or want to. If you change water conditions though, just be sure to acclimate him to the new water.

 

I have a betta in a 125 gallon - it has yet to drown and it swims all over the tank.

 

Holy moly!!! He must be the happiest betta alive!

 

One of these days someone is going to top jaysee's 125 gallon betta home, and we will all gasp. Do keep an eye on him though. Some do stress out at bigger tanks, but most take to them like ...well, like fish to water.

 

It lives with cichlids, rainbows, loaches, barbs and gouramis.

I think we are going to put one in the 225.

 

Oh lord. Betta in 225? You are my new "bettas don't like large tanks" comeback.
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The filtration on the 125 does 975 gallons per hour, in case anyone was wondering.