Ghost shrimp & Molly/Platy fry.
 

I am going to set up a 10-20 gallon tank for my fish fry... I need a little bit of a clean up crew of extra food and stuff. Thinking ghost shrimp might be nice to have. :) Would they eat the fry? I don't think they could catch the fry when they are awake... but if the fry are asleep?

No they won't.
However shrimp are extremely sensitive to ANY NO's or ammonia peaks so its strongly advisable to not add them to that tank until its starting to establish, live plants would help there as well and then add them like half a year down the Rd.
That said, you say "clean up" crew even thou they will eat any access foods, that will not eliminate the weekly water exchanges, for the best development of your fry and the shrimps health super good water quality is necessary.

Natalie, with seeding my new 5g planted tank, do you think I need to wait a while before adding the GS?

I've heard of ghost shrimp eating fry before, but they're not good enough at it to have any significant impact on fry production in a tank full of prolific livebearers.

Ok :) Thanks. I heard of it as well. But I just can't imagine a ghost shrimp being able to catch one... unless it was sick/weak in which case it'd probably die anyways..