If not using a sump, were you planning on using a hang on skimmer? If you are worried about water polishing you could add a phosban reactor to run carbon in a forced manner.
Do you have any pictures of the spot you were planning on using the cannister? Could you have a small "ish" sump built to fit the space?
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- Greg
90G : Light - Tek 6xT5 | Skim - EuroReef RS135 | Flow - 2xVortech MP40W | Control - Reef Keeper 2
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