water bugs

[cc]

I saw some light grey color bugs that look a lot like spider on the soil of my lilies, they move lighing fast. The one yesterday is about an iche long, the body is longer than a spider. What is it and are they harmful?

[CT]

They are harmless. Water Striders
http://www.mtbaker.wednet.edu/harmony/ditch/water_strider.htm

[cc]

Thanks Kay, I checked the link and that's not what I saw, it has eight legs instead of four.

[karen J]

Could be the nymph of a dragonfly or damselfly. I forgot how many legs they have. 
I've got a few bugs in my swamp pond that are so fast I can't even count the legs.

Does it have a long or short body?

[Julles]

They're under the water??  That sounds more like a nymph of some kind.

[cc]

Yes, they are under water and on the surface of soil, the big one has a long wide body grey in color that blend into the soil color about inch long and the small one looks exactly like a small spider. I will grap my camera the next time w/o disturbing it, hope to get a shot of it.