I've got 3 Gastromyzon beaufortia in my tank, and they're cool. They don't grow huge, and they're devour all the algae no problem. They don't school together or anything though. They're very skitty and zip off at the sight of other fish.
Notably, these aren't tropical fish, they're very much coldwater. They live in fastflowing hillstreams and the water is always COLD and WELL OXYGENATED. So it is best to replicate this in home aquaria, with fast flow also.