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I use my sump as a settling tank...bare bottom, skimmer, heater, low flow...in my high flow display tank, most of the dirt and detritus end up in the sump to be easily siphoned out. Just my opinion
 

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my vote would be bare bottom....as above for ease of cleaning. If using as true fuge....that might make a substrate a needed item. Depends on what you want to grow. If just macro algea and some pods....a few pieces of live rock and good lighting should be all you need.
 
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