Sucker fish would out grow your tank, and I think your talking about pleco because Chinese Algae Eaters prefer colder water from what I've heard. What do you plan on doing with your fry, they will need a 29g+ tank eventually. However, you could try some shrimp that could eat some leftover debris. Shrimp have almost no bioload too, you can keep like 15/gallon if you had nothing else.