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I'm afraid I have no pictures to offer. The only 20 I have is a long currently belonging to my Leopard Gecko, and I'm not even sure I have pictures of it when it was set up as a divided tank...
However, I can say that a 20 high isn't going to offer a whole lot of room divided. With bettas, you really want to try for something longer rather then taller....undivided a high is just a few inches more then a 10, so on its own its pretty okay, but even dividing it in half gives you a space that is a good four inches taller rather then longer per fish....
Personally, I wouldn't bother dividing it unless you only did it once for a pair of PKs or Females who don't have those big heavy fins to lug up to get air and food. In a taller space, a larger-finned betta is going to have a rougher time.
If you're really tight for space and looking to cut down to one tank, why not just divide one of your 10s?
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