They MAY predate on babies but that is a big may they are so small I don't see them being able to kill or eat a full grown shrimp.
i used this with a dimmer. it was too bright without the dimmer
i had enough of it floating around too, was glad i took it out. the current from the biocube pump even moves this coarse concrete sand, but then it exposes
dartboard ; )
or after you get fish, take some macro shots of them, blow some up on canvas(always a groupon deal)...few different ones
I'll bet it will work great if you keep it above the glass top or taped to your fixture. They might look good way down low on the outside of the tank