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I think you still need the overflow. You pumping from the sump to the skimmer. Without an overflow (hang-on box or in-tank chamber) how would the water get from the tank to the sump? A pump in the display tank to the sump?
Or have i misunderstood the question?
(ps, i am a beginner, i might be wrong above)
ops sorry....my bad wasnt thinking...midday blonde moment:razz:
. You pumping from the sump to the skimmer. Without an overflow (hang-on box or in-tank chamber) how would the water get from the tank to the sump? A pump in the display tank to the sump?