Anemone's only show up at night?

So I took a shower after reading and decided to check the tank (day 3, er evening 3 of setting it up, ~15lbs live rock) and noticed some small (1/6th of an inch) anemone's that I didn't see at all the past three days. So trying to catch them in the act I flip the halide on. It looks like one of the annoying anems (not the ap one, the ma one (sorry don't know the name). Anyway, it shrinks when the light comes on and the rest of them disappear as well...

Aside from the kazillion snails that I found crawling around the live rock, are these the bad guys, and since i'm only on day 3 of cycling, should I worry?

I've already seen a few tiny bristleworms and some 1/4" guys that look like giant copepods. The snails are tan and white, that look like astrea - sorry no pics was in a rush to count all the things that appeared.

I'm more worried about the anem's, as I can prolly get shrimp/crabs to eat the worms...

 

coralmorphs they r harmless search ball anemones