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I have a quite one 4000 in my sump which pumps about 1000 gph. I also have a wave maker on the side about 200 gph. I do have an algae problem at the time being. I was asking if it is recommended to vacuum the substrate when doing a water change. I have heard conflicting stories. My tank is...

I have aragonite. I only have about 1-1/2" depth.

When doing a water change is it standard practice to siphon the substrate? In general how much substrate should be in a tank?