i have a 10 gallon i'm cycling. i have 3 ghost shrimp (one dead, one gravid) and many many live plants (that came with lots of baby mystery snails). i started cycling on 2/3/11. well today i saw an arthropod with the shape of a pond skimmer swimming around my tank. what in the world is it? it had the 4 long legs it used to paddle with and it looked like the front legs tucked under head, it was super tiny, and i am pretty good with insects, it looked remarkably like a pond skimmer, but under the water (due to the filter's waterfall pushing it under). so any ideas?