alright googled scuds, I don't think it's that. Those things look way too big.
I did a little research and I think they might be cyclops, but they are so small you can't really make out any distinguishing characteristics. Some have two tails, some have one and the ones that are really small just look like dots and you can't make out a tail at all.
I think the white worms are nematodes. But I only saw the one and haven't seen it since. According to this http://www.planetinverts.com/what_is_that_bug_in_my_aquarium.html
both are harmless
If anyone has more info, feel free to share.