[Blackfeet]

Without knowing your water parameters (pH, kH, and soft or hard water) I am limited as to the quality of my advice. Right now assuming you have sand substrate then maybe a loach or catfish. None of your fish listed are bottom feeders. I like dojos, but they need pristine water partly because they don't have scales and they will burrow into they sand so this would help to keep your substrate from getting impacted

 

[Blackfeet]

He is right. I assumed the 65 meant gallons not liters. According to 1 inch of fish per gallon you are over stocked but it more depends on your bio load. What is your nitrates, nitrates, and ammonia when it comes time to do the water change. If they are any higher than the the first level on the scale I'd say you are fully stocked. I like a buffer to be able to catch problems before they kill my fish and I can smell a problem when it gets worse than those levels. If you are still good then a siamese algae eater (make sure it is not a flying fox) or a bristle nose pleco. They usually don't stop eating tank algae when they get large but common plecos do after they get past 6 inches