I've recently put an angel in a planted tank with cherry shrimp. The angel went hunting for the little morsels. Didn't see it actually eat one but the shrimps definitely went into hiding. Transferred the angel out to a new tank and the shrimps came out of hiding.
Or I could put cherry shrimp into my other tank with my betta if my angel goes after the shrimp. But i'll try the angel with the shrimp first, if he goes after them.. i'm moving the shrimp to my 5 gallon.