[cypher]

That looks nice, I'm sure they'll enjoy it

There's a thread here on posting photos.
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Signs of bullying are generally more squeaking going on, one ham chasing another a lot, especially if they go for the back end where they tend to bite if they're going to, sometimes you will see what might look like mating behaviour but is actually a dominance issue, if one ham seems to be growing & thriving & the other not then it's often a sign of bullying & the dominant one preventing the other from getting enough food.
I think you'll be able to tell quite easily if there's a problem so don't worry too much.