I should have been more specific with my question.
I meant the difference in behaviour between Hypergastromyzon and the other balitorids.
My Hypergastromyzon are the boldest and most active species in the tank; they behave like little children.
At night they will rest in the strongest current.
The only problem I had in the beginning is to get them used to the offered food; Some will start feeding after a few days, others after several weeks.
None of my Gastromyzon will eat live or frozen food, only algae, tablets with Spirulina, vegetables. The Hypergastromyzon do like the tablets and will eat some live and frozen food.They do graze on the algae, but not as much and efficient as the Gastromyzon.