I have 3 zebra danios in a new tank. Cycling has been for about a week now and in the past week I have noticed 1 of the 3 danios completely bullies the other 2. it IS slightly bigger than the other 2 danios. One of the danios being bullied hides in the corner of the tank most of the time. What should I do to solve this problem? should i do anything? and is it normal?