Adding a refugium/sump to my established RSM 130d

I wanted to know if I need to cycle the water or anything I need
To do to the sump. I was going to use miricle mud but people are telling me to just use live sand is there a difference?
I have a refugium light and pulling my chateo from the back sump of my DT
I ordered a overflow box prefilter from Jeff @ lifereef.
Any advice would be appreciated

Thank you happy reefing everyone
 
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