Can an overated skimmer be bad?

[ToXIc]

scenario: 120g tank

would running a skimmer rated for a 240g be bad on the system? ie not make it work correctly, will it still pull out the same amount of skim using a simmer rated 120-150g?

 

[-Logzor]

In some cases a drastically overrated skimmer will not produce a foam head. In your case I think this will be fine, as it's not grossly over sized.