Regal angel trying to kill cleaner shrimp

[jaganshi066]

My 4" Indo-Pacific regal angel is nipping at my blood cleaner shrimp. At first, I thought he was just trying to get cleaner shrimp's attention. But no, he won't stop nipping at him and shrimp is not doing so well. The cleaner shrimp was in the tank before the angelfish. I have never seen this before. Any thoughts?

I know this is going to sound weird but my yellow tang has always bullied and killed at my cleaner shrimp and I feed like 4-5 times a day so I doubt it has to do with feeding. The yellow tang has even nipped some of the shrimp antenna off, and I was always wondering why they aren’t long. My shrimp now stays under a rock or at the very corner of the tank.

 

[Phlynamjax]

I never really had any issue with angels killing my shrimp. I really want pair of fire shrimps, but my bandits and regals are keep killing them so I am giving up on the shrimp.