What Is Suitable For These?

[littlelegs]

Im thinking of getting either of the following for my tank:
Bristlenose catfish
candy striped pleco
pitbull pleco

What other fish is suitable to go with either of these 3?

At the moment i have only 10 neon tetras in 20g tank.

 

[stang1]

Harlequins would be nice and White Cloud Mountain Minnows. Maybe Javanese rice fish, quite plain but have beautiful blue eyes.