From what I've read in this forum posted by the experts, cannister filters are nitrate factories. I used to run mine straight from the factory full of the foam and media that it came with along with a small skimmer. Since then I've removed the skimmer and gutted my cannister filling it full of live rock with the bottom tray containing carbon. This set-up by the way is on a 20gal. If you're talking about a 125-150gal tank, I'm not sure if it's worth running a cannister fliter on it. Go with a sump, skimmer and live rock.
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