Looking back on some old threads and I need to give an end to this story. I was so excited about the eating Red Sea regal that I cut short the quarantine period and put him in my established 125 with healthy fish.
I don't know what it was, I suspect velvet, but within two days all but two of my fish were dead.
I panicked and put the surviving fish from the 125 into the 75, which then also nuked that tank. I wasn't as educated on fish disease, so I thought it had to be something wrong with the tank itself, not the fish.
NEVER skip quarantine! Completely changed the hobby for me, I was sick about it.