Hi has anyone come across a cory following a oranda around, picking almost grazing on the head of a oranda ? I have 3 fancy goldfish and a couple of corydoras in my 160ltre tank, all very healthy but recently one of the corys has been picking away at one of my oranda's head he does have a good head growth on him but he does not seem too botherd about it, its just that I have never seen this before and its only happening with this one fish . Is it ok? or should I take the cory out of the tank I don't want the oranda's scales or head growth damaged ...any help please thanks.