What are these 2 marine plants?

I bought 7lbs of some tonga branching rock and found one with this tiny amount of marine plant growing on it, can you tell me what they are?

 

The stuff on the left looks like either caulerpa nummularia or caulerpa racemosa. I'd say it looks more like nummularia. Both can be extremely invasive, so unless you really know what you are doing, I'd remove it. The stuff on the right looks like chaeto. That is very safe and I'd recommend to keep it as it will help to remove nitrates and phosphates from the water.

Here's a link that shows the caulerpa:

http://www.reefdup.com/2012/04/13/algae-green/

 

Not sure about the stuff on the left but the stuff on the right looks like a few strands of chateo.

 

ohhh! caulerpa and chaeto. very cool! I read lots on here about chaeto, there both in my sump/refugium right now. should I still get rid of the caulerpa in there?

 

I'd get rid of the caulerpa, good chance it goes sexual on you and turns into a nightmare

 

Calurpa and cheap

 

OK! i'll get rid of that, I been alternating the lighting, when my MT lights our on, my refugium lights are off and ETC. Hope that chaeto takes off for me, I also got some shaving brush growing real nice in there.

 

If you read up on Caulerpa, it can actually be quite beneficial if you monitor it daily.

 

so is chaeto without the potential problems

 

Agreed, just saying not everyone should just dismiss it right away without even reading up on it 8)