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- Aug 10, 2016
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hello all I am replacing my 180 gal display with 50gal sump and hob overflow to 320 gal with 125 refugium sump. my question what overflow to use. Tank is not drilled so m am unsure to drill bottom or drill back for synergy reef overflow. thinking of 4000gph turn over so looking a 2 inch bulkhead. thanks for all input



