I just bought a 120 gallon tank fom a fellow member. My question is as follows. The tank is drilled for a close loop 4 outlets and 2 inlets. I would like to put an oceansmotion on it but wondered how much flow i need and whaat a good pump would be and quiet? I have had a 55 gallon for about a year now and am intrested in some sps hopefully a mixed reef, but lots of sps. I am sure I will have plenty of other questions in the near future. Thanks in advance.