Saltwater "striders?" w/ pics

[nam2212]

I noticed something very odd while taking some photos of my tank tonight. I noticed an odd shadow while taking the pics and thought that a bug was flying next to the halide. On closer inspection, the insect was striding across the surface, much like a water strider would do on a pond. I caught 3 of them in a net and took a few pics of them. They were moving very fast. Does anyone have any idea what these things are? I can see a few more of them in my refugium, but have not caught them yet.

http://i36.photobucket.com/albums/e39/nam2212/P1000151.jpg

http://i36.photobucket.com/albums/e39/nam2212/P1000153.jpg

Thanks.

[nam2212]

I just found this while searching the forums, but the pics are not showing any longer. Maybe this is what they are. Thanks.

http://archive.reefcentral.com/forums/showthread.php?s=&threadid=611050&highlight=strider