When I first plugged it in just a day later the red filter change light came on. I took out the filter and put it back in. I also reinstalled the batteries. I've done about nine filter changes and never saw the red filter change light again. I have a size 10 silent filter in a 5 gallon tank and I feel like it's not strong enough even in a 5 gallon tank. I've used tiny filters for five gallon tanks that clean the water better than this one. What I really appreciate is that I don't have to refill it every time the power goes out or when I unplug it. When purchasing I would say buy a larger size than you think you will need.
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