My tank is a 180 with a 60 gallon sump. For the past week or so I have lost an orino and my fish are developing all sorts of problems. My orino developed ick and died and now my second bass has ick as well. 3 out of 5 of my datnoids have started to develop cloud eye. I thought that for some reason my tank went into a cycle. (I never added anything new so didn't think of where the ick came from). I thought my test kit was old since it showed perfect water quality at 0 ammonia and 0 nitrites. I got so desperate i went out and bought another test kit and it also shows 0 ammonia and 0 nitrite. My fish just seem to be getting worse. I then realized that maybe have 550 watts of ebo jager heaters aren't enough. I have a 250W and a 350W in the tank. I checked my thermometer and it showed my tank was at 75. I had the heaters set at 80. So I'm wondering if the cause of all my problems are poor heating because I assume that overnight since it gets so cold the temps might be dropping to the point where its causing my fishes problems. This is the first winter i've had my tank in the garage and its always been perfectly fine before