I take it you're using the canister output as a flow supplement? I have a Rena XP canister running carbon on my system & while the nozzle does provide a bit of flow, the bulk of my water movement is provided by a couple of VorTech MP40s. I certainly don't consider the canister flow even close to adequate for providing water movement in my system. The canister simply provides a tiny bit of extra chaos near the middle of the tank where the VorTech flow drops off. And I consider it a little self contained mini sump, adding another gallon or so to total water volume. Every little bit helps when you're running sumpless.
Having said all that, is there a reason you can't do both as I do? Just add the Koralia or whatever powerhead suits you needs & continue running all the other filters. Trying to save power?
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