Hi Axieboy,
There may be many factors as to their aggresion at meal time.
How old are the axies? (if unknown, what size are they in inches?) Juveniles tend to be more aggresive than adults.
How often are you feeding them?
How large is the tank?
Are there sufficient hides? Ideally, you should have at least two hides PER axolotl to give them a choice and allow them to spend 'time out' from one another.
If your two black axies are Wildtype axolotls, these tend to be more 'aggresive' than the albinos.
I would recommend that when feeding the axies, you feed them as far from one another as you can. Axies will lunge at their food and can bite their tank mates by accident.
Whereabouts are they nudging the albino? Is it constant nudging? Is the albino following them around the tank? If they are nudging the albino's cloaca this could be a prelude to eggs.
If these two axies are bullying the albino however, you may need to consider either a tank divider or moving the albino to another tank.
A little more information will help us help you lol.