Shrimp would be fine, especially for a 10 gallon divided. However I suggest avoiding known places that have diseases in their tank. If you know it, still get them, you get the disease with that 50/50 chance. and I would not chance it. Quarantine, I would. They can get ich, they can get sick, and they can die. Treating them with meds is different than treating a betta with meds due to their lack of scales.
Quarantine for at least a week.
Otherwise you could go with snails. In a divided tank unfortunately there is no other species that I know of that could thrive in there, as most (fish, or bottom feeders) need the full space, or more space.
Breed for the breed, not for the money; the words any REAL breeder would understand.
You must know nothing in order to know all, for all is nothing and nothing is for all.