Copperbands in a Reef

[Tracey2]

My copperbands are all different, one nips a bit at acans but doesn't touch the zoas in her tank, another in a different tank is my big suck, she prefers to eat from my hand and doesn't seem to touch any coral, my third I don't know how she survives, I never see her eat anything but she must find something in the tank, I have had her for about a year.