I have a 125 gallon tank, with 160-200lbs of live rock, 60lbs of crush coral on one side of the tank and 50-60lbs of live sand on the other side. i have 2 hob and 3 circulating pumps, it has been set up since feb 2013, i have never done a "water change" I just add water when needed, the fish, inverts and coral are doing great. has anyone ever done it this way before?


