Adding a 2nd clownfish?

The existing one will almost certainly pick on the new one. This isn't a bad thing though. The smaller fish will almost certainly eventually submit and the larger one will become the dominant fish (and eventually the female.)

If they are very small and both are juveniles it is possible that tehy won't fight at all for some time. Eventually they will start to become adults and will settle the dominance issues. This is usually expedited if one is significantly larger than the other.
 
Will the existing one hurt the new one or just chace it around? I don't want any serious fighting. That would be bad.
 
there will be definite chasing involved. cant say if there will be serious damage, but that is par for the course. Both fish sound like they are juveniles so they should pair off after a while. just keep an eye out for any extreme bodily damage.
 
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