I have a TV & computer next to the tank So I usually watch a 20 minute show during the feedings. Some fish KNOW it's feeding time, some figure it out after they notice everyone gathered at the drop location.
If you have 2 neon's that a huge reason why they might not be eating. The larger the number of number of Neons, the less they'll freak out
Also I've seen some teeny tiny neons for sale. While they're cute, they may not survive if they're stressed. Something to think about.
The place I get my fish has a 15 day guarantee, but I don't know what would happen if the fish was eaten whole.
Out of all the barbs & tetras, my black neons are usually the slowest to react when it comes to food, unless I drop something above their heads.