Sea Erchin ---Anyone have experience with these??

[es355lucille]

So I was looking at the TOTM tanks from Reef Central....and this one guy has a large tank and I noticed in the video that he also has a long spiny erchin as well in amongst all his beautiful SPS.

I have an erchin in another small tank that I am going to take down. What are the thoughts of putting him in my large 140 display?? (couple SPS / mushrooms / Rics )

The one I have does not have long spines.......but not the really short ones either....his spines are approx 1" long and I can see blue in between the spines. Maybe he is a long spine....just a juvee.

Thanks in advance.