Help with plant ID

[dan83]

I have a plant that i got with a rock at a local store that is doing very well in my tank (i have only 2x18?watt standard fluorescent lights, one actinic, one day since my MH broke) but the tank is by a window with a lot of light. I will post a picture later but the plant is vine like, with 2 inch "leaves" shaped like a sawblade on both sides.
any ideas?

 

[kpk]

Actually I think it is called sawblade caulerpa. Your lights will probably be ok??

 

[bang guy]

It probably an algae and not a plant. Your description resembles Caulerpa serulata.

 

[dan83]

thanks thats it. here is a picture from another site: