I have a 5 gallon invert tank that sits on my desk. I love watching these guys I put a new java fern in last night and my cherry shrimp have been going to town cleaning it. I also have a few white wriggly worms in this tank. One of the worms swam into the plant and apparently too close to a male cherry shrimp. Well the shrimp grabbed it and ate it! Part of the worm got away but it was swimming badly I suspect it may not have made it. The shrimp just finished is meal and went back to cleaning the java fern. I've never seen any behavior like this, it was cool to see.