Fungus gnat larvae
 

for those who haven't seen one.......its just under the leaf in the photo. ( it has 3 separate dark masses in its body )
You know you have a serious infestation when the media surface is covered with tiny silky webs.
I don't worry because they are a food supply for my butterworts and I actually let them breed on a 2 week cycle. Every 2 weeks I get rid of most of the adults by placing 2 butterworts in the grow area. They stay there for about a week and then I remove them......and the cycle goes on.

http://img.tapatalk.com/d/13/09/10/mu9u8aqu.jpg

gah! I hate those things! :p

Thanks for the pic - I'm sure it will be helpful!

I don't see it. Can you mark up the photo?

I took it on my cell, don't know how to mark up - unless you can via OB edit ?
It is parallel to the leaf....

OK, I think I see it. Are the larvae larger than the gnats themselves?

yep - approx 1.5 to 2 x the size.

Found this article which is very informative
Fungus Gnats Management Guidelines--UC IPM