The system has been up for about a year and a half. I have been monitoring the urchin and he has been a good boy. I got rid of about 3 of them and now only have the one. He never stays in one place very long, so I am ok with him for now. The mandarin has been in there for about a month and he too visits the entire length of rock. He eats all the time, but the fuge seems to be feeding the tank fairly well. Regarding the rock. I am actually searching for the perfect piece of rock right now. I want to find a somewhat large, flat rock that will fit behind the reef against the glass that I can drill holes and place shelves into it. I may have to make a piece out of concrete, then soak it in SW for a while to get all the bad and icky stuff out of the concrete. I have read about people doing it, but dont know how long to wait between the time the concrete cures until it can go into the tank. So far, the base rock I have in there is being seeded nicely. Small amounts of coraline spreading as well as some mushrooms and polyps. I actually had the bubble tip anemone split from 1 anemone into 3 seperats anemones about 2 weeks before the crash. Since then, I have added a second power sweep and a 40W UV sterilizer. I no longer dose with kents tech A&B and switched to dripping Kalk - 1 gallon a week. This hobby is like an addictive drug huh?