Hmmm Skimmer question.

[Azilla]

I was wondering does the skimmer water volume goe as the size of your sump or the total volume of water in a system???? What i mean is i have a 75g tank then 50-55G of water in my sump another 20G in my fuge
So total of 150G so does this mean i need a 150G skimmer or will 100G skimmer do just as well. I was lookin at a euroreef skimmer but there #$$$$
Any other good priced skimmers that will do well for me please tell me.
see i bought a USED TURBO FLOTER1000 SKIMMER from someone in AZ and i never got it. I keep asking for money back but still nothing. Im fed up and need a skimmer.