hi, i'm new and am setting up a 75 gal pre-drilled tank with a 20 gal sump below. i'd like to add a 20-30gal refugium, i'm not able to put it above the tank, it will have to be about waist high. i'd like to take water from the main tank to the ref and then back to the main. my question is what's the best way to go about getting the proper amount of flow to the ref, and what size/brand pump and overflow should i use? how much flow would be ideal?
thanks



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