I had the same issue in my 136 gallon tank.Recenlty the YT chased a majestic angel for 02 days,found the angel on the floor the next day.
Sorry to hear that.....
Maybe some are different but I found my YT to be very territorial and it swam aggressively all over my tank.....it was finding new ways to sneak up on the CBB by day 2.....the YT has a new home now. And the CBB is still munching on mysis looking great! I find the CBB to be a much more relaxing and passive fish to watch in the dt too. I hope this thread helps anyone who is thinking of putting the two together. IME I would strongly suggest against it and simple google searches on the two would back me up too....lol gotta love having google on your side hahaha
Would still love to hear more people's experiences with the two fish.....