I know when dividing tanks that the space, namely the length in which a betta has to swim, is just as important as the gallons. So here's my question. Automatically assuming water changes will be frequent, which would be better divided 3 ways:
The Petco bookshelf tank, which is 24" long so each betta would get 8" but it's only 6.6g
A regular 10g, which is 20" long so each betta would get a little over 6"
The height is not nearly as important in this case because the bettas going in this tank can't deal with height very well for various reasons (floaty, sinky, heavy tail etc).
What do you guys think? Advice would be most welcomed. :D