IMO ditch the ATO section out to allow for more room in the return section, and skimmer chamber. my sump was a 20L and found it super tight even with only 3 sections. make your return as large as you can, to allow for less chance of the pump running dry in the event that you forget to top off your ATO res. if your only having a 5g ato res. just use a bucket :P
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I'm not 'fallow' you must be talking about my tank!
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