tango -
I have a long spined urchin...the spines do get very long..I'd say mine has spines around 6-8" and they are still growing... he munch on corraline, but also on other types of algae - he spent all last night chowing on some macros
they are really cool, probably one of my tank favs right now. This is also because I alsmost lost him in the beginning. Lost all his spines, could hardly move about, just hung out in the corner. But slowly he recovered...and is now super active.
I tried to capture him the other day to see if he would do some pruning in the sump...no luck....they can move quick when they want to.
another plus...they look hilarious when they poop...perfect little spherical droppings.
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