Might be a good time to increase the tank size. I hear at 6 weeks you can add more water and/or move the fry to a larger 'grow-out' tank. A 5gal size is pretty restrictive. Can you add water to the other side, warm it up and remove the divider to allow them more space for a few more weeks.
That might buy you some more time before you have to jar the aggresive ones.
That might buy you some more time before you have to jar the aggresive ones.