Hi, I had a successful 180 plus a 30 add on (both using same sump) and it was a great hit in my school for kids with social/ emotional disabilities. It recently got a crack in the bottom, so I have drained it and given away all my livestock. I joined the forum because I am thinking about starting a new reef here at the school. I am thinking that checking out this forum might help me decide whether or not I have the energy to take the plunge again with a new tank for my school!