I had a lot of those little buggers around me on my night dive. I have no idea what they were and when I asked the dive master she didn't know either. Fortunately they were attracted to my light so I let it dangle below me when I ran into them.
I did not even see them....I was just getting ready to get back onto the catameran (sp?) from snorkeling and all of a sudden it felt like I was being stung by a jellyfish...but nothing was around me that I could see.....Did you have a wetsuit on??? I imagine that would stop those little buggers..!!
Did get to see some cool stuff before they attacked me though...
Sounds like you got hit by jellyfish larvae. The little buggers that I saw were about the size of a grain of rice and moved very quickly. I never wear a wetsuit in Aruba, though I may look for a thin shortie at some point.