Can a Urchin really eat coraline algea?

[flyingfish 2626]

I have posted a few times in the past about my lack of coraline algea growth in my 7 month old 55 gallon tank. I have around 60# of live rock, half I bought from Drs Foster and half from my LFS. I have developed some growth on a couple of pieces and on the powerhead/filter areas, but not really any coraline algea growth on my rocks. I have a wet/dry filter with a Octopus skimmer and Nova T5 lights. I just relized that my Pincushion Urchin ate a large section on one of my pieces. Has this been my problem the whole time. Is the urchin eating it faster than I can grow it? Some of my LFS liverock looks white and bleached to me but water parameters look good. Any help would be great.
Calcium 410
PH 8.0
DKH 8
Phosphate 0
temp 76
salenity 1.026

 

[roka64]

Yep, mine chow down on it. If you look closely at the rock, you should see the "teeth" marks (they looks like little stars).
It will grow back.

 

[Kurt_Nelson]

Yup... they will, and they do.

 

[nanoluvr]

they love it, Amigo