Bulldog plecos get to be 6" long. I don't believe there is any fish that will stay under 1 inch, even a 1 inch fish is really small you probably couldn't really see it if it was under 1".A bulldog pleco, a hillstream loach/hong kong pleco, and some shrimp can also do that job.
There are lots of fish that only grow up to 1" (or under)Bulldog plecos get to be 6" long. I don't believe there is any fish that will stay under 1 inch, even a 1 inch fish is really small you probably couldn't really see it if it was under 1".![]()