Green/Yellow Worm Thing
 

I was looking at my live rock to see if anything new showed up, because it's a newly established aquarium. I noticed something weird and green with tentacle like things. I can't really tell if it's moving with the current or moving on it's own so I really need this thing ID'd so I can remove it right away if it's bad. Please help! :(

Here's a link to the video:
https://drive.google.com/file/d/0B56...it?usp=sharing

I looked, but not sure. Maybe a nudibranch of some sort? Hopefully someone knows that has a bit more experience.

Yea, kinda looks like a lettuce nuidibrach

You may want to try the "Other invertebrates" forum, and getting any additional images of it that you can. If you could tell us where the rock is from, that could help as well.

Thanks for the tip! I hadn't noticed that forum xD
If you mean where I purchased it, I got it at Petco a couple of days ago, as for what part of the ocean they pulled it from or where it was shipped the the store from, I have not idea.