What are these?

[05Xrunner]

Well I got this live rock about a month ago. It had all these polyps on it. I convinced the guy to sell it to me and I got the rock for 20bucks...Its about 2.5lb
I have no idea what they are but I hope they spread.

 

[05Xrunner]

closer shot

 

[ct_vol]

Not sure what they are, but they are purdy... Do you have or have experience with the Canon EF 100mm f2.8 Macro??? I'm debating between that lens and the Sigma 150mm Macro you have listed...

 

[05Xrunner]

the canon one is good to...You really cant go wrong with ANY of the macros out there
Sigma 105,150, tokina 100, Tamron 90, Canon 100

they are all superb. Its just the canon and the Sigma 150 both have the USM/HSM focus and non rotating and does not extend when focusing