Sounds like normal fry behaviour to me. They seem to go thru a real curious phase when they're still quite small, then I think it dawns on them that there are bad things out there that are out to get them and they go all spooky and silly

I had the same thing with some Electric Yellow fry. They were really curious and would come charging up to the front of the tank til they reached about 3/4 of an inch, after that they spend most of their time hiding and having hysterics whenever I went near them. They should grow out of it as they get a little older and more able to defend themselves

Give them plenty of places to hide in, that shoudl help them feel a little more secure.