So my newest tank had velvet and the very last fish, (there was only 3 but still sad), died. I loathe velvet with every fiber of my being. Now, I’m wondering what to do. I want to change the substrate anyway so I thought I would chick the old and start new, change the filter/media and let it “cycle” for a few days and then put my two fish from QT in there. Question is, is that gonna be a disaster, does velvet live on the live rock without fish? Can I dip the rocks to kill any velvet left? Basically, where do I go from here. TIA