I got my very first betta as a gift along with this tank.  I've only used this as a transitional tank for my bettas to live in for the first couple of days to a week until the larger tank has finished cycling through.  People have a misconception that Betta fish are not very active fish, but that's based on when they buy them at the store and they look sort of dead.  The reason they don't move around is because they have been living in those cups their entire life and they're pretty much comatose.  At first they really like this little .5 gallon tank because its so much bigger than their cup and they'll swim around happily, but they will get bored of it extremely fast.  Not to mention this gets dirty FAST, and doing 10% water changes every 2-3 days is just not enough.  I keep a couple of gallons of pretreated water ready for water changes, so I was able to put my 2nd betta in this tank the day I got her.  I put the rocks in the first time with my male betta and he liked to rest on the black stones inside.  This time around I didn't put anything in there and I found she really likes to hide in the cubby hole.  My 6 month old female is small enough she could probably live in there for two weeks and be okay, but the male fish are absolutely WAY too big for this tank.

If you need a place to put your fish while you clean out their entire tank, or when you first get them and you want to set up a larger tank but it has to cycle through... I recommend this one.  Just remember water needs to treat for 2-3 days before you can put a fish in the tap water.  I was lucky and had some water ready on the second time around.  However, if you want a permanent home I would absolutely say do not get this one.  If a betta has adequate room they will spend all day swimming around in their tank.  They are very intelligent fish too who enjoy making bubbles and interacting with humans.  Imagine someone putting you in a small coat closet with nothing in it, with all white walls, nothing to keep yourself entertained, and making you live inside it for months, bringing you food occasionally.  That is about what betta fish feel like in these tanks.

I recommend the mini bow 2.5 gallon tanks.  I have one of them for each of my bettas.
I got my very first betta as a gift along with this tank. I've only used this as a transitional tank for my bettas to live in for the first couple of days to a week until the larger tank has finished cycling through. People have a misconception that Betta fish are not very active fish, but that's based on when they buy them at the store and they look sort of dead. The reason they don't move around is because they have been living in those cups their entire life and they're pretty much comatose. At first they really like this little. 5 gallon tank because its so much bigger than their cup and they'll swim around happily, but they will get bored of it extremely fast. Not to mention this gets dirty FAST, and doing 10% water changes every 2-3 days is just not enough. I keep a couple of gallons of pretreated water ready for water changes, so I was able to put my 2nd betta in this tank the day I got her. I put the rocks in the first time with my male betta and he liked to rest on the black stones inside. This time around I didn't put anything in there and I found she really likes to hide in the cubby hole. My 6 month old female is small enough she could probably live in there for two weeks and be okay, but the male fish are absolutely WAY too big for this tank. If you need a place to put your fish while you clean out their entire tank, or when you first get them and you want to set up a larger tank but it has to cycle through... I recommend this one. Just remember water needs to treat for 2-3 days before you can put a fish in the tap water. I was lucky and had some water ready on the second time around. However, if you want a permanent home I would absolutely say do not get this one. If a betta has adequate room they will spend all day swimming around in their tank. They are very intelligent fish too who enjoy making bubbles and interacting with humans. Imagine someone putting you in a small coat closet with nothing in it, with all white walls, nothing to keep yourself entertained, and making you live inside it for months, bringing you food occasionally. That is about what betta fish feel like in these tanks. I recommend the mini bow 2. 5 gallon tanks. I have one of them for each of my bettas.