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I have done a search on the forum for sea urchins, but did not seem to find much. I started my reef tank this past September 2005 by adding about 125lbs. of live rock. Attached to the live rock were several small 1-1.5 cm across sea urchins. Three and a half months later, several of these...

I am currently in the process of converting a fish tank to a reef tank. I've put down the deep sand bed, placed about 110 lbs. of live rock (which contained a nice assortment of snails, crabs, urchins and starfish). I have metal halide lighting and a chiller which keeps water temperature between...