I have been running a skimmerless, mineral mud type sump/refugium on my 72 for 2 years now. I grow several types of caulerpa and chaeto on 24 hour lighting. I don't do a lot of water changes and still have undetectable nitrate and phosphate levels. Seems to work for me. I may eventually add a skimmer to create a hybred system, but everything is going good so I'm not sure if I want to change.
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72 gal bowfromt mixed reef sps dominated, 25 gal mineral mud type sump/refugium Skimmerless
2x250 14000k phoenix hqi 2x96 pc actinic, 50x flow
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