I got 3 yellows and 3 randalls a year ago for my 58 gallon tank. No visible issues. I'm not sure how many are left, I see at least 2 yellows and 1 randall's for sure after a year. I did have a solo yellow many years ago that I thought had died and forgot about it. Then one day it plopped out of a rock when I removed a large coral, I hadn't seen it for over a year.