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Well, you can, but there won't be enough media to fill the canister so the 55 will have to cycle again. So what I would do if you can, is get the 55 up and running (filter and all) and go ahead and cycle it so when you switch it will already be cycled. In my 60g before I re-did it it had a marine land HOB cycled and I knew I wanted a canister on it instea of the HOB so I just got the canister and hooked it up on the tank with the HOB so it could get cycled, so when I took it all down and started over it was already cycled with the new filter...If that made sense! You can use as much seeded media as you can tho, anything can help!