Is my skimmer way to big?

[copenhagen_cowboy@live.co]

I am getting back in the hobby and setting up another tank, I have bought a load of stuff of someone who was shutting down. My tank will be a 80 gallon tank and probably about 30 gallon of water in the sump. The skimmer that is in the lot is a coralife cone skimmer 300g. Will this be to big and pull to much out or not run properly due to not a big enough bio load for it?