Found some exciting tiny life in my tank

[vishal1107]

Hi all,
It's been my 3 months when I started my reef tank.
Today I notices some small insect like creatures in my tank and there are like million of them there...
Not really sure what are they and are they good or bad..
I am attaching some pictures of three different insects I captured. Can anyone help me identifying them and if they are good or bad.

One is tailed like insect.
Second is like a snail in shape.
And third is very interesting, it shaped like a star.


Photos attached..

 

[blaxsun]

They're dinner for something!