I have absolutely no idea where it (the ich) came from! I'm thinking that the neons were already infected when I got them(end of Jan.). Luckily I was closely observing them and saw it! I started treatment around the 15th of Feb, so I should probably wait a couple of weeks to see if it comes back.
You're lucky! It's worse than head lice, fleas, and dust mites! It's claimed 6 fish from my tanks already... Hopefully I've got it under control and gone!