little bugs on my live rock

[lukasnca]

my friend gave me some live rock about a week ago. i was looking at it today and noticed that there are these little translucent brown/green bugs crawling around on it. i assume that this is normal but figured i'd ask. are any of these harmful to fish? they're about 1-2mm in length. i'd take a picture but they are just too small. they don't swim in the water -- they seem to just stay on the rock.

 

[austinsdad]

Normal. Pods of some sort. Check your sump or overflox box. You'll see more there.