Ok, so not a major problem, but I figured if I mentioned problems in the subject then more of you seasoned vets would come to my rescue. I have two hydrometers. One says my water is 1.020 and the other reads around 1.023. I was just wondering if there was a way to figure out which one was correct....or more correct. Also what should I have my water temp at? And what should my specific gravity be, like 1.026? I was also wondering how powerful my powerheads need to be in a 55 gallon tank. Thanks.