Good bugs? Also are these baby turbos or hitchhiker snails?

[Gavin1274]

Hey everyone, I have thousands of these little bugs in my tank and I figure they are the good ones but just want to be sure because there are so many? If they are the good ones are they the ones the pipe fish eat? And I noticed this the little circle creature as well And finally I have noticed these tiny little snails everywhere and they look like mini turbos but they could be the common hitchhiker ones. Any help IDing them would be great. Thank you

 

[LIreefguy]

Looks like isopods. All good don’t worry

 

[Greg P]

Pic 3 is definitely isopods. A wanted critter for sure.
Sorry, can't make out the other shots

 

[DSC reef]

Munnid isopods and medusa hydroids. Nothing to worry about, can't tell what the first pic is.

 

[reef lover]

And collinista snails...

 

[Lovemyreef2015]

First 2 pictures are collonista snails good guys. 3rd picture is munnid isopods also good guys. 4th and 5th picture are medusa hydroids, they will go away on their own and tend to show up in newer tanks. I don't see anything in the last picture.