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a u tube going from the skimmer section to the first baffle would also work, while causing no bubbles/splashing and be alot easier IMO. Heres my pathetic paint illusion if how it can be done. Gluck
Very similar to my sump. Although wouldnt u want the return to be the last one? and the refugium to be in the middle having the most area? Thats how mine is so just letting you know.