So I have (7) 5 week old yellow lab fry in a 10 gal by themselves. Is it normal for them to be "fighting" already? I am guessing this is probably natural but wanted to hear others experience. The biggest one, who already has a little black on it's top fin, is the tank bully but a couple of them try to stand up to it, especially when it's guarding food. I had (8) but one died. Not sure if it was from aggression or not, it didn't look sick or beat up.