Unfortunately that skimmer will not work on that small tank. The skimmer is rated for tanks 150 gal (Heavy bioload) to 250 gallons light. Even at a full bioload, 100 gallons does not equate to 150 gallons of heavy bioload. We are also talking about just the tank not including the sump. In your case, a better skimmer would have been the CLSC-150INT.
Your tank is unable to create enough organics to make the wider body of the CLSC-200INT work correctly. The CLSC-200INT has an 8" body while the 150INT has a 6" body.