Shrimp are a wonderful choice, with a low bioload. You can have large numbers, (6-10 usually is what people have) without a problem, and they do a wonderful job scavenging the rocks for fallen food. They do better in at least a group of 3, and since their bioload is small they beat the cories.... Adding cories, you need usually 4-6 or more, and they poop a lot. :/ or at least, that is what I found.
For a 10 gallon, it is harder. cories are...iffy. Plecos are a definite no. Any other fish, which there are ones like tetras or platys, or molies, that also scavenge wouldn't fit in the tank.
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.