JFYI, on my reefer350, I have added about 12 fish about a months ago, all at once, after QT them and they are all still alive and eating well.
I know I will get flamed for saying this and I apologize in advance to those who have been in this hobby longer than me but just wanted to let it out there that I was also a firm believer of long fishless cycling when I first jumped into this hobby back in 2000
I've set up over 10 tanks since September last year, after taking a long break and have never lost a fish due to cycling issue when using Biospira, please note I am specifically pinpointing a brand as I have tried a few others (Dr. Tim, Stability, Fritz Zyme7)