Hello, how's your tank set up is it a fowlr, reef etc.? If your tank has live rock you won't need any media in your canister as a matter of fact it would be detrimental and cause you nitrate problems down the road. I wouldn't use the bio wheel either for the same reason. Keep in mind in s.w. you need at LEAST 10x per hour water turn over and more if you can get it.
hth
Max
hth
Max