I have a couple of baby red eyes that are 3/4 of an inch or less and they are feeding greet on pin head crickets. I tried the fruit flys with my first baby and he didn't seem that interested. As soon as I put in the pinhead crickets he seemed to pay more attention. Now that those pinheads are a week older both frogs are chasing after them. Besides they don't climb out of the tank like the fruit flys. The only problem with the crickets is that they jump and are impossible to pickup at that size. Use those tubes that stick down in the cricket keeper and quickly pull it out and shake them in.