Lighting will depend on what you plan on keeping in the tank. For FOWLR, lighting is not as important as with corals. I have heard mixed reviews on Odyssea lighting, more not so great than good. If you have an overflow, are you adding a sump/fuge? You can don't need a canister, I like them for added water volume (at least on my 125), the ability to add more LR rubble and run media if needed.