My girls do not bother mine. They are very good at blending into my plants though - about the only time I see them is if they happen to be hanging on the glass.
And yes, they are one of the coolest looking kinds of suckerfish!
The Boy Feesh: Indigo CT, Lavatail CT, Ghost CT, Chicory HM, Redfish VT, Magic DT
The Girl Feesh: Christmas CT, Shine VT, Snowflake CT, Stripes VT, Midnight CT, Grif VT, Tangerine VT, Wraith CT, Amethyst VT, Ice CT, Poe CT, Turquoise II CT