What is this?

[RiverRay]

live rock can be interesting i love buying live rock when i need it because so many new things awaits you. i got a really cool surprise in one of my live rocks the other day. i went to add the new rock in and as i did a few hours later i noticed a whole new fish in my tank. looked him up and it was a lawn mower blenny. i couldn't believe that i got one of those haha saved me some money XD
ya fireworms are a hassle.. hard to get those things out

 

[shark32]

Cloudburst- I only saw like four of the flatworms and they were white or green. I haven't seen any recently though . Those pineapple are everywhere in my tank too.

RiverRay- that's awesome that you got a fish in your live rock!! Hope he is doing well! One piece I had gotten had a tiger serpent star in it!! He slithered out when I put the rock in and almost gave me a heart attack. I wasn't expecting anything to move while I was deciding the best position for the rock. LOL Live rock is certainly cool! I have recently found a type of spaghetti worm on my rock the other day!!