I'm going to be changing out my substrate here soon. I'll be going from the coarse aragonite to sand. My question is; is it better to use live or dry sand? Does it matter? Will the tank mini-cycle afterwards?
Just dry sand. No it shouldn't cycle. The dry sand will become live just like dead rock will become Live rock. I used a mix of aragonite and sand for my substrate. Why are you looking at chaning yours out?