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Thanks for the response. I am going to attempt to post a photo to help identify. I am in the process of setting up a reef tank. https://www.livingreefs.com/gallery/files/2/1/9/IMG_2163.jpg

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...

Brandon, Thanks for the reply. After reading your comments, I may be leaving the metal halides on a bit longer than I should be. Right now I illuminate with an actinic only light for about two hours in the morning, the MH's turn on about 11 am and stay on until 6 pm, then the actinics...

I added more live rock and now I am satisfied with the look I have attained. One thing that is bothering me now is that I am starting to have green algae starting to show up just below the sand line and on some of the rock. Any suggestions so that the aquarium doesn't succumb to this unsightly...

Thanks for the responses and words of encouragement. The only bioload I've added where several snails. The rest of the creatures hitched a ride on the live rock! I have been testing the water regularly and my values have been within expected parameters. I will want to add additional live rock...

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...