Just because a Betta can survive in small conditions because in their natural environment during the drought season doesn't mean that we should keep them in those conditions. Many Bettas don't survive these rough conditions that nature provides in their home territory. If you buy small cups and throw a fish in them- you are just condemning them to solitary confinement in a prison cell. My Betta is in a 10 gallon tank and you wouldn't believe the fun he has exercising and playing in all that space. If you care- you would never subject this beautiful creature to cups of water if you saw them in gallons of HEATED (they are tropical fish) water!!!!!! Study this fish and you will understand that we take for granted their survival mechanisms and exploit them for our own foolish pleasure.
note before my review: Yea ok, so everyone QQing over this needs to just think about it from a breeders standpoint...I jar my bettas in quart mason jars. The males anyways. I do not see how this is any different. The ONLY downside and I mean ONLY, is that the divider is not a solid color, preventing the males from seeing each other. Is this meant for keeping a betta forever and ever as a HOME? No...But as a breeding standpoint, it is fine. If you are stupid enough to think a breeder would have a gallon-per-male, you are wrong. It is more cost and space efficient for mason jars, beanie baby boxes, or these small acrylic breeders.
So.........if you dont like it because it is "cruel", dont write a review. Reviews are only helpful if you point out flaws in construction, pricing, etc. Your opinion means jack from a consumer standpoint.
I rate this product a 4, and that is because the divider is NOT a solid color. Bi-weekly water changes are suggested and this setup is NOT suggested for long-term use. <--proper review