Waterbox 20. A little over a year with the tank. I'm honestly still unsure about some coral placements. Particularly my hammer, the gonis, monitpora, green star, favias and chalice. Do I need more rock? Should I stop buying corals....it's become a little addiction lol. Right side of the tank is where most flow is with the return nozzle and nano pump pointing that way. Also if anyone has a A.I prime reef light setting perfect for mixed reef that would be great. All advice is taken. Thanks.