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Yup, same with my angels. They nibble fingers and when they don't have food they check the tube. Only time they have ever tried to actually bite is when they think I'm too close to eggs, even if I'm not close!
I actually had a tank of 4 guppies that would swim up and nibble any part of you that was in the tank, fingers, arm, palms. They left the tube alone though. Unfortunately they passed away due to a fungus. I miss the little guys.