I honestly like this tank myself. It would work out nicely with 3 bettas. The one thing is I would suggest making sure you place plants next to the dividers to help block the view so that the bettas are not required to always see the others. Making sure that you have at least one cave like structure in each section to help each one hide when it needs to is another thing to make sure of. Does this tank have a lid and a place to put a heater? While I have no issue with bettas in this tank, I do not recommend any other fish be kept in here unless the dividers are removed. Shrimp are another option for someone if they wanted to keep 3 separate color morphs in the same tank.