You probably want something that is 1/2 gallon or more, but sometimes you can have .3 gal. or .4 gallon, but those are for the small ones. If you get a crowntail betta. DEFINITELY get one 1/2 gallon or more.
Betta fish grow to be an average of 2 inches from head to the beginning of the tail. They usually grow to weigh an ounce. Remember that female Betta are smaller than male Betta. I bought my male Betta fish an inch and a half long and in grew to 2 inches in about 6 months.
Betta fish don't need much. Most are kept in small bowls that can fit comfortably in two hands. but, its always nice to give them more room to swim. maybe between half a gallon and a full gallon? also only use spring water for their tanks (room temperature) or they could die. plus, keep them separated. they will in fact fight to the death (a word of advice: sounds cool, it isn't, don't try!)
A gallon, at least.
Excluding fins. A well grown male Betta has a body about 2.5 to 3 inches long. A large female would be about 1.5 to 2 inches.
Size can depend on the specific type but the more common ones I believe are around 3 inches and larger specimens reaching about a foot.
2- 4 inches is think
a betta bowl is about 12-15 inches in length and about the same in height
They look just like Big betta fish, but smaller.
it looks like they have a big bubble in their side
No
The first rule of fish keeping is "1 inch of fish needs a minimum of 1 gallon of water" Your 'bowl' is not big enough to keep one fish healthy let alone two and a Betta. Goldfish are coldwater fish and need temperatures around 55F. Bettas are tropical fish and need temperatures around 80F so you can see that they should not be kept together anyway.Simple answer is NO. They need totally different living conditions. 1 Betta needs a 5 gallon (nominal) tank. Two goldfish need a 25 gallon tank.
Platys can sometimes be kept in a bowl, if the bowl is big enough and in a warm enough area. Generally, though, fish bowls should be banned and not used.
The average is 1.5 inches
The Betta probably likes BIG spaces best
most likely around 4 inches
it depends how big the fish bowl is
If the fish bowl is big enough, yes.
This is for betta fish but you can use it for other fish too but why would you keep a fish in a bowl tha's not a betta? Betta are the only fish that can stay in a bowl: When you first get the fish clean out the bowl (make sure there's no dust or anything). How to clean the bowl the first time: At the first time you need completely new water for the fish. Wipe the bowl and make sure it doesn't have dust, residue, or anything dirty make it super clean and shiny. You'll need to put warmish water into the bowl and add water cleaner so it doesn't harm the fish. You can buy water cleaner from your local pet store (the one you got the fish from). And your bowl is ready to go. Second time cleaning the bowl: Make sure you have a container to put your fish in when you clean the water. It has to be big enough so your fish can swim in it. Now you take just a little bit of the old water and keep it for the bowl after. Okay, now you take the fish out with a net and put it in a container with water in it. Now you take out the extra water in the bowl that has poop in it and stuff and put it down the sink or something. Then you clean the bowl if you have to and add water wih water cleaner into the bowl. Also leave some room for the old water from the bowl before it was cleaned so the betta doesn't get shocked or anything from the water change. Then, add water cleaner to the bowl again. Now take your fish out of the container with the net and put your fish back to where he was. That's about it. And also after a few weeks change ALL of the water and keep it warmish. If you change the water temperature to cold right away he'll go into shock for the change of temperature! hope I helped :)