red stuff (im sorry i didnt mean to make it an asap but read)

dude you need to start googling things like "feather dusters growing on my live rock" and "red things with arms growing on live rock" etc etc you will find a lot of your questions there... also at the top of the google results you can click "images" and thats helpful too when ID'ing stuff!!

 

i think you answered your own question. they probably feather dusters
you will get alot of feather duster hitchhikers. only exotic ones are really large like you see for sale at the fish store. they won't get any bigger though but they will reproduce.

 

I GOT IT!!! this pic is kind of bad cause the "arms" have sorta like a claw appearance and slightly slant in.

 

great the picture is horrible. it was crystal clear before. hold on

 

hjljkhljkhlj

 

a little better

 

The most common hitchhikers I have got are aiptasia, small dusters and sponges. Nothing else really except for the occasional bristleworm.

 

im pretty sure its a type of sponge, i had a couple of those they didn't really get any bigger.

 

its really hard to tell from the pic... it could either be a sponge or Foraminiferans, most likely Homotrema rubrum -
if it has little strings that come out, called rhizopodia it is a foram.

 

K+ Nano. Good answer. Not that I am confirming it. I am just in awe.