Will Australian Rainbow Fish attack and eat adult red cherry shrimp?

I got a stow-away Australian rainbow fish when I bought some plants for my tank. He's grown up with the adult red cherries I've had for about 5 month now, he eats all their babies but recently I noticed pieces of dead adult shrimp in the tank and 3 of my 9 adults are missing... Is it possible that my Australian rainbow fish has grown big enough and aggressive enough that he is attacking and killing adult shrimp? Something else could've killed the shrimp first and then he could have eaten them, but the 6 remaining shrimp appear healthy enough, bright red and the females are pregnant.