What brand/model skimmer are we talking about here?
And how were you planning on getting the water from the skimmer back into the tank? Were you thinking of hanging the skimmer on the tank, but just plumbing the output from your cannister to the input of the skimmer?
Unless you're talking a Remora HOB
, most skimmers use a venturi to suck air into the water column at the pump. You wouldn't have that with your plan, which would make your skimmer not work. If you are talking about a Remora HOB
, the pump included with the skimmer is sized to make the spray nozzle work effectively - without the air venturi. Using a different sized pump (the cannister) would either not make the skimmer work at all, or at least not as effectively.
Not seeing this as a really good plan...