I know mbuna will pick them apart when they moult. The tangs you chose hunt, so they probably will too. Plus the fish stay along the rockwork, which is where the julies will mostly stay(not 100% sure on the leleupi) so chances of them getting snagged and eaten in the middle of their slumber would be fairly high and would happen at some point in time.
*Awhile ago, I had a blue crayfish that ate some of my fish alive