Males biting and leaving scabs.

Question
One of my male rats keeps biting the other, he is older and bigger. I know fighting is normal and playful but he's made some quite nasty scabs form on the other one's back. The'yre quite large but i don't think they're infected. should i seperate them? They still sleep together and eat together so i'm a bit confused...
Thanks for reading, i really need an answer. x

Answer
I hate to tell you to separate them, but if he is hurting the other  one, thats not acceptable nor fair to the other rat. How much of an age difference is there between the two rats?

You may want to let them live apart but visit during the day so they can sleep together.  Allow them to play together during the day time but make sure its supervised only. Set up a play area for them to play in and use the idea from my website on how to construct a cardboard wall in order to make a nice enclosure to let the rats play together safely while you interact with them. Use this time to also let the older rat know his behavior is not acceptable by stopping him when he starts to bother the other rat and put him back in his cage for a few minutes. Do this each time he starts to really fight with the younger rat. He will eventually get the idea that his behavior is getting him back into he cage and he will want to avoid this so he will end up getting the idea. Reward him with a treat each time he does NOT bother the other rat.

Here is the link to my website.  Check out GETTING STARTED to get an idea on how to make the play area so the two rats can have a fun and safe place to play,  

If he should become more aggressive, you may want to look into neutering him.  Neutering is not a real invasive surgery like spaying is, but it should only be done by a good exotic vet that is well qualified to operate on rats.