I keep ghost shrimp with my cherry shrimp, no issues that i know of.
I've only seem them grab a fish once, that was when a ghost shrimp and my betta both wanted to eat the same worm.
The betta grabbed the worm and swam off, the shrimp grabbed the betta and tried to climb up him to the worm.
No damage done.
I get ghost shrimp at my LFS for 1$ for 12 as snacks for my cichlids. They last about 5 tenths of a second in my tank. I'm not sure why you would keep them in your tank as a pet, but if all else fails your fish will be happy you gave them a nice snack. They're cheap enough to test it out. If you want to buy more expensive shrimp, I suggest using these 1st and if they survive for a few weeks buy some more expensive ornamental ones. But remove the ghost shrimp before adding the new ones.