imo , what works for me is about 4-6 times flow of the DT thru the sump. depending on how big your sump is. i have a 75 sump on my 180 and have a mag 18. i get about 900-1000 gph flow but my sump is split into 3 chamber. the outsides flow into the center. on my fuge i have less flow for more exposure time. my chaeto is doubling weekly from the slow flow and single 6500k 23 watt bulb.
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