I have 2 corydoras and a betta in a 5 gallon tank. I have noticed that just today, one of the corydora's have been fin nipping the betta. I know that this isn't a normal behavior for the corydoras since they are peaceful fish. His tail isn't damaged or anything, but I am afraid that this could become a potential problem. Is this a problem that I should watch or is it nothing? Thanks for the help.