looking for guidance or advice regarding Canister filtration. I'm currently running a 55gl all in one plug in play. Because of the lack of space all I'm running is tunze skimmer and a hang on back media reactor. I'm 3 months in the cycling "ugly" stage and want to get a jump on things before I start a mix-coral reef. I do have fish and inverts and all are fine thus far. So my question; would it be over kill if I add a canister filter to this system because I have no sump? any advice would help...