Clean the foot with some betadine and apply neosporin a couple times a day for 5 or so days. Make sure they're on a clean surface line the enclosure with paper towel.
If the nipped toe is black its already in the process of falling off. You can use neosporin just put a little on it everyday and keep a eye on it for swelling and infection.
They're all different sizes as long as they are active and healthy I wouldn't worry. I have another males that's 10 months old 22" 540 grams and a female that I just aquired that's 7 months old 12" and 140 grams. She was housed with 5 other bd's though. Only had her a week she'll prob start...
How old is your bd? What's the length and weight?
True German Giants reach 24" + and weigh around 1000 grams or so.
Here's a pic of my 8 month old..he's 23 1/2 " and 525 grams. I'm not sure of his bloodlines but he might have some german giant.
Just be careful and watch close. Here's my 11 month old male he is highly aggressive towards other beardies. This vid is in his new 4x2x2 pvc enclosure I picked up for $20 at a garage sale...just added glass!
I totally have a reptile addiction! Right now I have 8 2 beardies,3 monitors,uro,turtle and a python. Years ago I had around 18 reptiles. I don't know what it is ever since I was young I've always loved reptiles.