Protein Skimmer Ratings

Truckie

Reefing newb
I asked this question in the middle of a different thread, but I'm still not clear on the answer.

What is the appropriate size skimmer for a 90 gallon tank? I was told to look for one that is rated for twice the volume of the tank, but skimmers usually have two numbers in the specs:
-What size tank they are rated for
-The gallons per hour that they flow

So, would I look for a skimmer that says it's rated for over 180 gallons, or one that flows at least 180 gallons per hour?

Would this skimmer work for me? It is rated for a 125 gallon tank, and flows 500gph.
Reef Octopus Hang-on-the-Back 2000 OCT-BH2000 - English
 
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