There are some shrimp you can have but they are not all that appealing.
You can have amano shrimp, I have kept these with angels before so I think they will be fine. They don't breed in freshwater just to let you know. For a 26 gal you could keep probably keep 7-10 they do work on the substrate they are my favorite shrimp for clean up.
You could also keep bamboo shrim but these shrimp are huge they can get 4 inches long. They also can not breed in freshwater. You could have maybe 4 or 5 although they don't clean the substrate as much they pick off floating particles that float into there fan like hands/claws.
Those are the only ones that I know are suitable