I am no expert what soever but from what I understand, you could run a complete system with only powerheads, a protein skimmer and tons of LR.
Thats what I am doing 
And to add, a forum member told me that canister filters can only do more harm then good in the long run.
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PowerJetPlumbing.com
Set up: Coral Reef (soon to be)
1xTunze Skimmer, 2xKoralia, 1"xSandbed, 1x150w Heater, 50lbsxLive Rock
Also keep various reptiles, 6 snakes, 1 panther chameleon
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