What is this? Medusa worm? Algae? Dino?

[earthboy17]

I have some localized 'threads' appearing in the bottom of my tank.
They don't seem to be in the water column, but rather spreading across the sand (and on a frag).

I thought it was a medusa/spaghetti worm at first, but after seeing it on the zoa frag I can see that it is not.
I hope it's just some goofy type of algae, but I would expect it to proliferate differently if it was.
The same goes for if it was dinoflagellates. I would expect them to be everywhere and on everything.

Please see the video below and help me figure out what it is
...and how to treat it!

Thanks,
Tom

<embed width="600" height="361" type="application/x-shockwave-flash" allowFullscreen="true" allowNetworking="all" wmode="transparent" src="http://static.photobucket.com/player.swf" flashvars="file=http%3A%2F%2Fvid246.photobucket.com%2Falbums%2Fgg112%2Fearthboy17%2FSANY0001.mp4">

[earthboy17]

Bumpity bump bump


Posted from ReefCentral.com App for Android

[earthboy17]

Bumpity bump bump


Posted from ReefCentral.com App for Android

[125G Reefer]

How old is that tank? Looks like Diatoms. I know you say relatively new, so thats what I'm going with, your LR doesn't even have any color in it yet. Diatom Bloom

[cloak]

Check this out.

http://www.reefcleaners.org/index.php?option=com_content&view=article&id=54&Itemid=60

[earthboy17]

At this point it's about 3 months old.
Everything in it came from either dry (rock/sand), mix saltwater, or was dipped.
I had Dinos before and it sucked.

Thanks for the link Cloak.

[kurt_n]

I'd go with some type of algae. Seems stringy, but doesn't really look like dino.