How do you determine how many gallons you have for your sump to how many gallons your aquarium is?
The more media the better. Not sure if there's a right way people put canisters in their big tanks so that's like less than 10 gallons of media so any sump will hold far more media than any canister. That being said people usually do 40-60 gallon sumps on 180+ tanks
That's salt water no idea with thatOk next question how do you determine the size of the protein skimmer per gallon of water in the aquarium?