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I have a 55g sump on my 120g FW display. But I don't use any baffles, just a single open chamber. I use a bean animal overflow which goes into filter socks. My bio media is seachem pond matrix and eheim susbstrat pro in laundry bags. I also use a "TetraPond Submersible Flat Box Filter" connected to my return, which is a JEbao 6000. I don't worry about evaporation because I use an autodrip system. Never had any issues.
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