Thanks for the advice! I have another question, Right now I have 130lbs sand, 60lbs base rock and 20lbs of live rock that has been in the tank for a week, this weekend I plan on adding another 40lbs of L/R, can I wait until the weekend to do my water change when I add the new live rock? Right now my ammonia is 0.25 nitrite 5.0 and nitrate 20. or will the high nitrite kill things off quickly...Thanks for the info I am still wet behind the ears when it comes to saltwater....