Canister
I have been running a Fluval 405 for the last 1.5 years on my 40 gallon. Ideally a sump would be better but my tank is happy and very healthy. We do have a Hydor Slim Skim skimmer. For the filter I have the foam prefilter that comes with it and all the compartments are crammed rull of live rock rubble. You probably want to clean the foam every 2 weeks and I do 10% weekly water changes. We have a few LPS species and a small bubbletip anemone. Its very do-able. Just my experience.
Hal
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